Perl Weekly - all the articles published by Gabor Szabo

http://szabgab.com/

PAUSE: SZABGAB

@szabgab

2011.09.08 in #7 Lessons from running Perl Weekly for the first 6 weeks
This is another article I wrote, this time on my own blog, describing my experience with this list. It might be interesting to you if you'd like to look a bit at the details. I am also comparing the experience with that of Peter Cooper who runs the Ruby Weekly which was the inspiration to this newsletter.
2011.09.09 in #8 Which is the better language to learn Perl or PHP?
I wrote this article in response to a question I got. I tried to make the comparison related to the job opportunities. The article was quite popular but the strange thing was that some of the comments on Google Plus and Twitter related to the relative qualities of the two languages and not the career opportunities.
2011.09.26 in #9 Perl Polls: What articles would you like to read?
I've launched the Perl polls web site with the first poll asking where you get Perl news and what articles would you like to read?
2011.10.29 in #14 Number Guessing game
Partially in response to the discussions about the sad state of the Perl Tutorials I restarted posting my own tutorials. This is the beginning of a simple and stupid game I wrote a long time ago in another country and in another language.
2011.11.03 in #15 Testing a simple Perl module
When starting a new module it is very easy to start writing unit tests from the beginning. In this article, from yours truly, you can learn how to use the Perl testing framework in the most simple way. This article marks the renewal of the Test Automation Tips newsletter. If you are interested, please subscribe.
2011.11.03 in #15 Lots of new entries in the Perl Tutorial
I think in the last week I've published 5 new entries in the Perl Tutorial. They are all more or less equal in importance so instead of pointing out one of them, I am linking to the main page of the whole tutorial.
2011.11.09 in #16 Perl Tutorial: Scalar and List context in Perl, the size of an array
2011.11.15 in #17 How to teach 'Modern' Perl?
People have strong opinion on what Modern Perl means. Unfortunatelly those things don't always work out of the box and sometimes it isn't a good thing to teach those practices at all. At least not as the first experience in tha language. In this article I was trying to discuss some of the issues I see.
2011.11.27 in #18 Beginner Perl Maven
Announcing the first online video course I started to record. This is for people learning Perl. There is a special discount coupon for those visiting this page in the next day or so. Feel free to invite your friends to use this discount. It expires in less than 3 days.
2011.12.07 in #20 Advanced Perl Maven online video course
When I announced the course I offered a 81% discount for 3 days. I'd like to offer this discount to you, the reader of the Perl Weekly as well: Until the 15th December 2011 you'll be able to buy the advanced course for $9 instead of $49 using the 'advanced_intro_9' coupon. The two parts of the Beginner course also have discount codes: 'beginner_15' and 'beginner2_15' respectively for $15 instead of $39 each.
2011.12.22 in #22 7 Curated Weekly newsletters for programmers, sysadmins and what's in between
I posted a list of 7 + 2 newsletter. The JavaScript Weekly and the Ruby Weekly that inspired the Perl Weekly and a few others that had the same inspiration.
2012.01.05 in #24 Minimal requirement to build a sane CPAN package
(szabgab) I encounter people who have already written a module or two and now they are considering uploading them to CPAN or just packaging them for easier distribution. In this article I show the minimal step for a simple pure-Perl module.
2012.01.10 in #25 How to read a CSV file using Perl?
When parsing an CSV file one would probably start using split() just to find out soon that it only works in simple cases. For more complex cases Text::CSV_XS is a much better solution.
2012.01.14 in #25 How to get the Perl Weekly every day?
If you'd like to get the news of Perl weekly even earlier, or if you'd like to recommend individual posts, you can do that through any of 3 social networks.
2012.01.14 in #27 How to get the Perl Weekly every day?
Luckily I recently started to share links to articles as I notice them. That already helps me put together the newsletter. If you are interested to follow, you can do it on Google+, Facebook or Twitter.
2012.01.15 in #25 Use of uninitialized value
Perl can provide various warnings and errors that can be very unclear to people who are new to perl. In this article I try to explain the 'Use of uninitialized value' warning.
2012.01.17 in #26 Global symbol requires explicit package name
This error message is one of the most confusing ones to beginners. In this article I try to explain what should a beginner understand from it.
2012.01.31 in #28 The right way to install CPAN modules
perlbrew? CPAN.pm ? cpanm? apt-get?
2012.02.03 in #28 Perl on the command line
While in most of the Perl tutorial I deal with scripts, here I give a small glimpse into the world of one-liners.
2012.02.04 in #28 Debugging Perl scripts
This is one of the first entries of the Perl Tutorial that gives some simple ideas how to debug Perl code.
2012.02.08 in #29 Automatic string to number conversion or casting in Perl
People coming from other programming languages often have trouble with the automatic string to number conversion in Perl. The comments also mention a couple of strange cases.
2012.02.09 in #29 $_ the default variable of Perl
IMHO for beginners it's quite hard to find explanation on what are the special variables of Perl. Especially $_ is confusing people and search engines. I hope my little contribution helps.
2012.02.10 in #29 Announcing my first Perl e-book
I have been planning to publish my Perl training materials along with the newly written Perl set of articles. This is the first one with the Beginner Perl Maven material.
2012.02.12 in #29 DWIM Perl 5.14 for Windows (v7) released
This is the second DWIM release in a week. The first one was using Perl 5.12 but this one already uses the latest version of Perl and includes more than 400 modules from CPAN.
2012.02.16 in #30 Matching numbers using Perl regex
I took a regex related question I saw on PDX.pm and described how I'd build the regex step-by-step. The string isn't too complex: 'Usage:524944/1000000 messages' but I hope this approach can help people learn how they can go about building a regular expression.
2012.02.25 in #31 What is a Perl Monger group for?
What is the value your Perl Monger group provides you? What would provide you with value that would make it worth for you to join? What does it mean to 'join' a Perl Monger group?
2012.03.01 in #32 TODO March 2012
I do monthly reports on my work and make my monthly plans public. You can also see some statistics about the number of Perl Weekly subscribers on the various channels.
2012.03.03 in #32 How to remove, copy or rename a file with Perl
Showing 3 functions for dealing with files in Perl with the PHP, Ruby and Python counterparts.
2012.03.10 in #33 Extracting data from a file with multi-line records
I was just asked by someone to help with processing a log file. In this article I show 2 solutions. One with a flag the other one with the flip-flop operator of Perl.
2012.03.11 in #33 How to build a dynamic web application using PSGI
This is already the second part of a series of articles introducing Plack/PSGI. The first one is linked from this article. They start off at the basics and we'll see what is interesting for people so I know what to write about.
2012.03.13 in #34 DWIM Perl for Linux server 5.14.2 v2 released
This is the first public release of this experimental package. The objective is to create a package that can be used for development or on a virtual host to develop and deploy applications written in Perl. It will include every important module that regular command line or web applications might need. Your feedback would be highly appreciated.
2012.03.28 in #36 How to create a Perl Module for code reuse?
A simple introduction to creating modules that can export functions.
2012.03.31 in #36 Scalable Vector Graphics with Perl
SVG allows you to create nice and scalable graphics using Perl. I wanted to play a bit with it and while reading the documentation I found some issues. So now I am a co-maintainer of the module. You are more than welcome to send bug reports, failing tests and fixes. You can also see a few simple examples in the blog.
2012.04.02 in #36 Perl Test Automation Training in Madison, Wisconsin and in Kiev, Ukraine
I am running two sets of the shortened, 2-days version of the training class.
2012.04.05 in #37 Simple Database access using Perl DBI and SQL
2012.04.15 in #38 Perl Weekly reaches 3,000 subscribers - two days later
This is a follow-up post
2012.04.26 in #40 Splice to slice and dice arrays in Perl
Part of the Perl Maven tutorial/book.
2012.04.28 in #40 Facebook vs Google+ for Perl projects
Listing the pages and comparing number of followers. If you are on either of those social networks, you might want to check out what pages you could follow.
2012.05.03 in #41 Perl Maven Cookbook
Before you get excited in the wrong direction, this has nothing to do with the Apache Maven. This is the first and admittedly very small edition of the Perl Maven Cookbook. This is also the announcement of the Perl Maven web site I have been planning (and not developing) for half a year now. The Cookbook is given exclusively (and free of charge) to the people who subscribe to the Perl Maven newsletter.
2012.08.10 in #55 Enlightened Modern Perl or useful Perl?
OK, this is not the only link from my sites, but this one is without technical content. It is a dilemma I have. You might want to share your opinion.
2012.09.08 in #59 The most popular Perl web sites
I created a list of perl-related web-sites and checked their rankings using Alexa. Here you can see the most visited sites. A few people were missing their own sites from the list, but actually I was hoping for more people to complain and give me ideas what other sites to track.
2012.09.15 in #60 23+2 Perl based open source products
This is the list of basically all the Perl-based open source products I could find. I used Alexa for ordering them, but that's not the point. The point is to understand the types of products built with Perl and if they are backed by one or more businesses or if they are volunteer based.
2012.09.27 in #62 Announcing the Perl Maven Competition
Some other languages already have it. It's time for the Perl developers to show the world they can also build beautiful applications. The planning has started.
2012.10.07 in #63 Building DWIM Perl for Linux
This is the first step in my attempt to (re)build the Perl distribution that will contain everything you will ever need to build Perl applications.
2012.11.25 in #70 Announcing the Regex Maven for Android
This application (will) help you learn or improve your knowledge of Regular Expression. It has (or will have) a tutorial, a cheat-sheet and a quiz. Currently available for Android, but once it has reasonable content, I am planning to release it to the iPhone as well.
2013-05-05 in #93 Interview with Tadeusz Sosnierz
Gabor Szabo's interview with Tadeusz Sosnierz (aka tadzik),the developer of the Perl 6 Pod Parser and Panda, the Perl 6 module installer.
2013.01.08 in #77 The license and the repository of Perl modules on CPAN
Calling all the CPAN authors to update the META information of their packages including the license field and the link to the repository where they develop the code. If there is one.
2013.01.27 in #80 Core Perl documentation and CPAN module documentation
Gabor Szabo offers a refresher on how to access Perl documentation (both for core stuff and modules).
2013.01.31 in #80 Fetching the status of blog entries using grep and cut
So, you left your blog entry directories 'grow organically', and now you want to tame the resulting unholy mess. Gabor Szabo shows us how he fought entropy with perl, grep, cut, and a good vacuum cleaner.
2013.02.03 in #80 New edition of the Advanced Perl Maven e-book was published
I've updated and released the edition of the Advanced Perl book. People who already purchased (or who attended my advanced course) can download it free.
2013.03.22 in #87 Perl developers and countries
In case you are interested in the distribution of the readers of the Perl Weekly and the Perl Maven site around the world, I published the data from Google Analytics and Bitly.
2013.03.27 in #88 YAPC::NA 2013 training classes
There are going to be 7 courses before and after YAPC::NA in Austin, TX. Check out the schedule and buy your tickets.
2013.05.16 in #95 Interview with John SJ Anderson (aka genehack)
Gabor Szabo is on an interview roll. This time, it's genehack's turn.
2013.05.21 in #96 Perl, Python, Ruby, PHP and HTML5 on Google trends
There are many ways to measure the 'market share' or 'mind share' of a programming language and the dynamics between languages. I tried to see how many people search for the respective terms and what are the trends in relative volume of searches.
2013.06.24 in #100 The first 100 weeks of the Perl Weekly
This is the 100th issue of the newsletter.
2013.07.12 in #103 There are no Perl events in my country/city...
A couple of days ago I saw one of the bloggers complaining about the above. I could not stop myself from writing this.
2013.07.18 in #104 Compiling Perl, Python and Ruby
Comparing the default installation size of the 3 major dynamic programming languages. Perl is the smallest, but Pythons has a lot of batteries included. There are many modules in the standard library of Python, that are missing from from the standard installation of Perl and thus require extra steps to install them from CPAN.
2013.08.01 in #106 Three month after domain name change
Once in a while I collect numbers from various sources trying to see how the Perl Maven site does and compare that with other Perl-related sites, and with sites related to PHP, Python and Ruby. It is unfortunate we don't have the visitor count of the major Perl community sites, but at least you might be able to interpolate from these numbers.
2013.11.18 in #122 Claiming your CPAN authorship at Google
Are you a CPAN author? Do you think that your module is useful? Even to people who use Google as their search engine? Here is a way you can help Google show your module in a more personal way.
2014.01.07 in #133 The Popularity of Perl in 2013
My collection of some numbers. Most interesting are the Google Analytics graphs from blogs.perl.org, MetaCPAN, and search.cpan.org.
2014.02.19 in #135 Sponsoring Perl events by running Perl training courses
Perl events need funding. Developers need training. Companies need more knowledgeable developer. Some of us like teaching and visiting places. A win-win situation. So if you are an organizer, please get in touch, but if you are a would be attendee at one of the events, you could also contact the organizers and ask them about courses.
2014.03.12 in #138 How did PHP and Python take over such a huge market-share of Perl?
In a nutshell: the 'ease of getting started' and 'batteries included' are two keys in those stories and while there are other issues, without solving these two Perl has no chance in getting in the ring again.
2014.04.01 in #141 use diagnostics; or use splain
Gabor Szabo reminds us that Perl can explain itself in more details, if we ask nicely.
2014.04.05 in #141 Fixing CPAN links on Stack Overflow
When answering a question on Stack Overflow, one can link to Perl modules in a way that will break once the module gets updated in the future (which makes us all sad), or in a way that will let all future generations enjoy the bestest and latest version of the module forever. Gabor shows us the difference.
2014.04.29 in #145 GitTip and the Perl Community
In a nutshell, I think if all the people who benefit from Perl contributed back to the community, the Perl ecosystem could do a lot more. So if you cannot contribute time, maybe you can contribute some money. GitTip is an easy way to do so.
2014.05.06 in #146 Thunderclap and the buzz for Perl
Thunderclap allow you to commit to send a specific tweet (or Facebook share) at a certain time in the future. I started a little experiment with it. If you like it, please join the action.
2014.05.14 in #147 Building a blog engine using Perl Dancer
Gabor Szabo showcases a nice primer on Dancer, via the making of a blog engine.
2014.05.20 in #148 One package perl pm file
While you can put more than one package in one .pm file, Gabor Szabo reminds us that we don't necessary want to do that.
2014.06.03 in #150 One year of Perl Maven Pro
Gabor has reasons to celebrate: Maven Pro is now one year old!
2014.07.01 in #154 Perl Maven - June 2014
Just my excuses why I have not published a lot of articles in June with links to the articles and screencasts I did publish... ~szabgab
2014.07.11 in #155 Perl Training and donation to TPF
Need Perl training, and willing to help TPF at the same time? Gabor Szabo has a proposition for you.
2014.08.07 in #159 Catalyst vs Dancer vs Mojolicious on Stack Overflow
I checked the number of posts on Stack Overflow tagged with each one of those: Catalyst: 380, Mojolicious: 213, Dancer: 133. Does this mean anything?
2014.08.14 in #160 perlprogramming.org
Gabor Szabo is the owner of the 'perlprogramming.org' domain, but doesn't really have a use for it. So he's asking if anybody is interested in taking over.
2014.10.18 in #171 Stats of 7 Perl-related web sites
Two weeks ago I created this small table based on the numbers from Google Analytics. The number of monthly users on search.cpan.org was 429,479. On metacpan.org it was 86,013.
2014.10.22 in #170 A clone of search.cpan.org
Gabor Szabo has started an open source clone of search.cpan.org, sco.perlmaven.com, which is built on MetaCPAN's API.
2014.11.03 in #172 Shutting down the Perl Community AdServer
It's time to say farewell... Gabor Szabo lets us know that the Perl community adserver is going down.
2014.11.17 in #174 Web sites with source code for hacking
Gabor Szabo (SZABGAB) has started curating a list of Perl-based web sites for which the source is available.
2014.12.02 in #176 Perl 5 Regex quantifiers
Gabor explains regular expression quantifiers, which specify how many of a given sub-pattern you want to match.
2014.12.11 in #177 Migrating (the Perl Maven site) from Dancer 1 to Dancer2
It took several days but finally the Perl Maven site is running on the new Dancer 2 framework. This article describes the issues encountered.
2014.12.17 in #178 How to set default values in Perl
Do you know how to give a default value to a scalar variable? What about a hash?
2014.12.21 in #178 PSGI the superglue between Perl web application frameworks and web servers
A collection of Perl Maven articles about PSGI, the interface for writing modern web applications in Perl.
2014.12.26 in #179 How to grep a file using Perl
Writing a Perl replacement of the Unix grep command does not have much value, unless you do something much better, or if you want to reimplement the Unix commands in Perl. Nevertheless it can be a good exercise, and it can be a learning or teaching aid.
2014.12.29 in #179 Installing Rakudo Perl 6
After another long break, I have updated the code behind the Perl 6 Maven site and started to update the tutorial as well. This is the first page showing how to install the newly release Rakudo Star on OSX and Linux.
2014.12.29 in #180 Is 2015 going to be the year of Perl 6 ?
I have been on-and-off Perl 6 for quite some time, so after the news about Larry Wall talking about Perl 6 being production ready in 2015 I started to wonder if I should start wrting about Perl 6 again. Judging by the comments on Reddit there are quite a few people who prefer to spew hatered than to be constructive. We'll see.
2015.01.01 in #180 Continuous Integration for Perl 6 modules using Travis-CI
Travis-CI does not support Perl 6 yet, but with this binary version of Rakudo Star you can hook up your GitHub repository and get it smoke-tested by Travis-CI.
2015.01.01 in #180 The Popularity of Perl in 2014
Some stats about the most frequently visited Perl-related web sites including pageview data from the biggest Perl-related web sites.
2015.01.05 in #181 Getting Started with Bailador
2015.01.07 in #181 How to get the size of a file in Perl
Using -s is simple, but looks strange for people not yet familiar with it. There are other, more readable ways to fetch the size of a file.
2015.01.11 in #181 Timestamp and elapsed time in Perl 6
Perl 6 has two separate functions fetching the time since the epoch and they return different results. As of today they are 35 seconds apart.
2015.01.15 in #182 The magic unary plus (+)
2015.01.17 in #182 Introduction to Perl 6 using REPL: scalars
Gabor's Perl 6 odyssey continues, demonstrating working with scalars. I can never remember what REPL stands for, so I googled it (again!) for you: Read-Eval-Print-Loop. It's just an interactive shell.
2015.01.17 in #182 Business Models for Open Source Content
Gabor looks at some of the most successful sites that have a money-making business based off open content.
2015.01.18 in #182 Welcome and Installation
The beginning of an old, and slightly noisy recording of the Perl Maven Video course.
2015.01.21 in #183 What is autovivification?
2015.01.25 in #183 Avoid (unwanted) bitwise operators
2015.02.01 in #185 Code Maven
Yours truly has opened a new playground for himself experimenting with Node.js (JavaScript), Flask (Python), and Ruby. (For now)
2015.02.02 in #185 Introduction to Perl 6: arrays (screencast)
2015.02.03 in #185 How to create an Excel file with Perl?
2015.02.10 in #186 Using the built-in debugger of Perl as REPL
An earlier screencast re-posted on the Perl Maven site.
2015.02.13 in #186 SVG - Scalable Vector Graphics with Perl
Some simple examples showing how to use the SVG Perl module to create Vector Graphics. Then, a related article was published on the Code Maven site using JavaScript to create SVG images, and there is even the beginning of an SVG tutorial with exercises.
2015.02.17 in #187 Don't keep generated files in version control
Files generated by the Perl toolchain, by the editor, an even by the operating system should usually be excluded from version control system. Here is a list of what should be excluded and how to to that.
2015.02.19 in #187 CPAN for older versions of Perl
Some explanation about the CPAN Testers and about cpXXXan.
2015.02.26 in #188 Combining SVG and PSGI
How to create Scalable Vector Graphics on the fly and serve it using Plack/PSGI?
2015.03 in #191 Sending HTML e-mail using Email::Stuffer
A screencast and article explaining and showing how to send e-mail with Perl.
2015.03.04 in #189 Comparing the speed of JSON decoders
Bottom-line: The XS version is 57.42 times faster than the pure Perl version.
2015.03.05 in #189 Creating bar graphs using Perl GD::Graph
13 slightly different bar-graphs from the same data series.
2015.03.10 in #190 Passing two arrays to a function
Just showing one of the uses of references...
2015.03.12 in #190 Moo and required attributes
... and how to convince Moo (or anything else) to give a clear(er) error messages.
2015.03.14 in #190 How to download a Perl module from CPAN
Sometimes you might want to download and unzip a whole distribution without even installing it. There are a number of ways to do this.
2015.03.22 in #191 Testing sessions by mocking time
How can you test a system that is supposed to time-our after 100 days? Your can't wait a 100 days for that. What about 1 minute? Is that still too much?
2015.03.23 in #192 Promoting your Perl workshop or conference?
Gabor has put together a page with some tips for promoting your Perl event.
2015.03.25 in #192 Sending Tweets from a Perl script
In this article full of screenshots you'll see how to write a Perl script to send messages via Twitter.
2015.03.26 in #192 Getting started - Create skeleton for the SCO clone application
A screencast in which Gabor shows the first step in creating a clone of the search.cpan.org web site using PSGI and MetaCPAN as the back-end.
2015.03.31 in #193 Methods, Functions and Subroutines in Perl and what is $self ?
What is the difference between a method and a function in Perl? What is in $self ? And what is $me ?
2015.04.02 in #193 Add some acceptance tests using search.cpan.org
A screencast from the series about the search.cpan.org cloning project.
2015.04.07 in #194 Checking the whois record of many domains
This article uses Net::Whois::Raw for the task.
2015.04.15 in #195 Fetching several web pages in parallel using AnyEvent
How to reduce the download time from 10 minutes to 1 minute?
2015.04.17 in #195 Create skeleton PSGI application for the SCO project
Trying to create a search.cpan.org clone using PSGI as front-end and MetaCPAN as back-end.
2015.04.21 in #196 Using fork to spread load to multiple cores
2015.04.27 in #197 Getting started with MongoDB using Perl - insert and simple update
2015.05.01 in #197 Writing Command line scripts and accepting command line parameters using Moo
MooX::Options is an integration of Moo, the minimal OOP framework for Perl and the Getopt::Long, the standard command line processing module. Reddit
2015.05.15 in #199 Indexing e-mails in an mbox
2015.05.17 in #199 Which CPAN distributions include jquery.js ?
Gabor's continuing his experimentation with an alternative interface for searching CPAN. He's added an interface that lets you find all distributions that contain a given filename.
2015.05.18 in #200 Updating MongoDB using Perl
The second part of the mini-series creating a command-line phonebook using Moo, MooX::Options, and MongoDB.
2015.05.19 in #200 Routing with PSGI
There are several modules that provide URL routing service, but if you'd like to see how they might work behind the scene, this article explains it. Oh and in case you are not familiar with the jargon, 'URL routing' means mapping URLs on your server to function calls that will serve the requested page.
2015.05.21 in #200 Get CPANstats from MetaCPAN using cron
The 12th episode from the search.cpan.org cloning project
2015.05.25 in #201 BEGIN block - running code during compilation
This might be natural to the seasoned Perl developer but the BEGIN block is powerful.
2015.05.26 in #201 Putting the email in MongoDB - part 1
Part of the mailbox indexing project.
2015.05.27 in #201 JSON in Perl
Which module to use to parse JSON in Perl?
2015.05.27 in #201 END block - running code after the application has ended
2015.06 in #205 Concurrent Requests and measuring performance with ApacheBench
2015.06.03 in #202 Bounty for fixing CPAN modules
Gabor pointed out bountysource, a service where you can provide bounties for certain bugs. He wonders if we could use this to get bugs fixed in key distributions?
2015.06.24 in #205 YAPC and Perl Workshop participant numbers
If you ever wondered how many people attend the different workshops and YAPCs, Gabor has compiled a partial list of those events, from 2013 onwards.
2015.06.25 in #205 LWP::UserAgent and Basic Authentication
2015.06.29 in #206 PSGI and AJAX for single-page applications
PSGI is the superglue connecting Perl to web servers. It is rather low level, but there are cases when you need to use that instead of one of the higher level frameworks.
2015.07.05 in #206 Beginner Perl Maven video course
Over 100 episodes have been uploaded to YouTube and are also available for free download.
2015.07.07 in #207 Don't use $a and $b outside of sort, not even for examples
2015.07.14 in #208 Data structure design for fast lookup
People talk a lot about code optimization, some even claim that using single quotes is faster than double quotes, but one of the things that can really matter is the data-structures we use to represent our data. In this article you'll see one example for consideration.
2015.07.17 in #208 Beginner Perl Maven video course
The slidecast Perl tutorial has passed 130 freely available episodes. Available on YouTube or downloadable from the Perl Maven site.
2015.07.17 in #209 Beginner Perl Maven video course
The slidecast Perl tutorial has passed 148 freely available episodes. Available on YouTube or downloadable from the Perl Maven site.
2015.07.17 in #210 Beginner Perl Maven video course
The slidecast Perl tutorial has passed 157 freely available episodes. Available on YouTube or downloadable from the Perl Maven site.
2015.07.17 in #211 Beginner Perl Maven video course
The slidecast Perl tutorial has passed 177 freely available episodes. Available on YouTube or downloadable from the Perl Maven site.
2015.07.20 in #208 Web development using Perl 6
I am preparing a talk with the same title for YAPC::EU. On this page I am trying to collect the existing Perl 6-based web applications. If you find one in your pocket, please let me know!
2015.07.23 in #209 Getting started with AngularJS
In preparation for the front-end development course at YAPC::EU, Gabor started to publish articles on using AngularJS.
2015.07.24 in #209 YAPC::EU - over 200 participants
More than 200 people have now signed up to attend YAPC::EU this year, passing two previous conferences. And there's still a month to go. Gabor points out there are some interesting talks, if you're still thinking about it.
2015.07.30 in #210 Echo text with Bailador using Template::Mojo
2015.08.07 in #211 TODO in AngularJS
The rite of passage entering the land of AngularJS.
2015.08.07 in #212 TODO in AngularJS
The rite of passage entering the land of AngularJS.
2015.08.13 in #212 Reporting diskspace usage on a mail server (screencast)
2015.08.15 in #212 Disk usage: du in Perl (screencast)
2015.08.18 in #213 Sites with public API with CORS - Cross-Origin Resource Sharing enabled
2015.08.19 in #213 Perl 5 Regex Cheat sheet
Quick look-up for the major regex features of Perl 5 with links to detailed explanation and examples.
2015.08.20 in #213 Reading Excel file using Perl
Using Spreadsheet::ParseExcel::Simple and Spreadsheet::ParseExcel, but actually recommending Spreadsheet::Read
2015.08.24 in #214 Vagrant Perl Development Environment (VirtualBox)
2015.08.24 in #214 AngularJS Tutorial
2015.09 in #218 POD - modules processing Plain Old Documentation format
Listing all the modules that handle POD.
2015.09.07 in #216 Data Serialization in Perl
A collection of pointers to Data::Dumper, Storable, FreezeThaw, YAML, JSON, XML, Sereal, and Data::Serializer
2015.09.14 in #216 Becoming a co-maintainer of a CPAN-module - the first steps
A series of articles showing lots of techniques for refactoring Perl code using the excuse of becomming a co-maintainer of Pod::Tree.
2015.09.16 in #217 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now bundled in one e-book available. There is a button at the bottom of the page where you can purchase the book.
2015.09.16 in #218 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now available bundled in one e-book in MOBI format for Kindle.
2015.09.16 in #219 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now available bundled in one e-book in MOBI format for Kindle.
2015.09.16 in #220 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now available bundled in one e-book in MOBI format for Kindle.
2015.09.16 in #221 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now available bundled in one e-book in MOBI format for Kindle.
2015.09.16 in #222 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now available bundled in one e-book in MOBI format for Kindle.
2015.09.16 in #223 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now available bundled in one e-book in MOBI format for Kindle.
2015.09.16 in #225 Perl Dancer book available
All the Perl Maven articles related to Perl Dancer, now available bundled in one e-book in MOBI format for Kindle.
2015.09.17 in #217 Travis-CI and latest version of Perl 5
Gabor asked how you can get Travis CI to test with Perl 5.22 and blead. One of the comments directed him to HAARG's Travis helpers, which is the reason why I included this post. Let Graham (HAARG) know if you'd like to see a "latest stable perl" capability in the helpers.
2015.09.19 in #217 Enable Travis-CI for Continous Integration
A simple Travis-CI configuration file.
2015.09.20 in #217 DBI - Database Independent Interface for Perl
The beginning of a page about DBI. Now including all the major DBD modules.
2015.09.21 in #218 XML and Perl
A collection of Perl modules dealing with XML along with a series of articles.
2015.09.24 in #218 http://perlmaven.com/logging-with-log4perl-the-easy-way
Screencast and article
2015.09.30 in #219 Multiple command line counters with plain TSV text file back-end
2015.10.01 in #219 YAPC::EU 2015 Granada - hiking to Pico del Veleta in Sierra Nevada
Gabor's report on his trip to Granada. His depiction of the local tapas alone makes me gnash my teeth and bemoans my absensce at the European YAPC.
2015.10.02 in #219 Vagrant Perl Development Environment v1.1.0 released
Not only it's a Perl Development Environment in a box, but Perl 6's rakudo is also included. Nifty!
2015.10.05 in #220 What is Expect?
Expect is tool to automate interaction with an application providing a CLI (Command Line Interface). Do you need an example?
2015.10.06 in #220 Contributing to the Open Source Perl Ecosystem
A collection of tasks, some are really low hanging fruits, to contribute to Perl 5, Perl 6, CPAN, etc.
2015.10.07 in #220 AUTOLOAD - handling Undefined subroutines
How to avoid ' Undefined subroutine ... called,' errors.
2015.10.10 in #220 Configure Travis-CI for Perl 6 modules
Gabor noticed that most Perl 6 modules on github don't have a Travis config file, so suggests that a PR might be a nice easy way to contribute to Perl 6.
2015.10.13 in #221 The future of YAPC::EU and YEF
2015.10.14 in #222 Programming Exercises
11 beginner level programming exercises with solutions in Perl.
2015.10.15 in #221 Profiling and 100 times speed improvement
In the last couple of months the Perl Maven site became quite slow. Running the profiler quickly pointed at the overuse of YAML. The easy solution was to replace it with YAML::XS.
2015.10.18 in #221 Introducing test automation with Test::Simple
Screencast, the first in a series about Test Automation using Perl.
2015.10.18 in #221 Exercise: Number guessing game
Started to publish a bunch of exercises for beginners. Some of the exercises already have solutions in a number of programming languages.
2015.10.19 in #222 Inconsistencies in YAML implementations
YAML seems to be more forgiving than YAML::XS, YAML::Syck, or YAML::Tiny.
2015.10.23 in #222 Reverse Polish Calculator in Perl using a stack
A 'standard' example for using a stack.
2015.11 in #226 Supporting the Perl Weekly?
Would you like to support the Perl Weekly? Just $1 an issue from each one of the readers would be fine. Is this newsletter worth $1 an issue for you? You can set up a weekly donation via Gratipay.
2015.11 in #226 AngularJS: filter table created with ng-repeat
2015.11.01 in #223 Command line counter with JSON backend
Another entry in the series of counter examples.
2015.11.07 in #224 Common DateTime operations
DateTime is huge, but as with most of other things we only use 10-20% of its capabilities. This article covers the most important aspects of the DateTime module.
2015.11.11 in #225 Test plan and test descriptions
What is the 'plan' in the tests written in Perl?
2015.11.15 in #225 Single Page Application with Perl Dancer and AngularJS
Dancer now allows you to create your own skeleton for new projects. This is a skeleton that makes it easy to create a Single-Page Application. One where your client-side applications talks to the web serve using AJAX.
2015.11.18 in #226 OOP - Object Oriented Perl
An introduction to the classical, hash-based OOP system of Perl.
2015.11.25 in #227 Generate random numbers in Perl with the rand() function
Gabor shows how to generate random numbers in Perl 5, using the rand() built-in.
2015.11.27 in #227 20 most popular Perl modules
Gabor presents the most searched-for modules on MetaCPAN and search.cpan.org, though the figures are slightly dubious, since App::Netdisco comes out top on MetaCPAN!
2015.11.30 in #227 Supporting the Perl Weekly?
Would you like to support the Perl Weekly? A Perl Job ad in the Perl Weekly, like the one above, will reach almost 6000 Perl developers. People like you, who are enthusiastic about Perl and not just use it as an add-on tool.
2015.11.30 in #228 Supporting the Perl Weekly?
Would you like to support the Perl Weekly? A Perl Job ad in the Perl Weekly, like the one above, will reach almost 6000 Perl developers. People like you, who are enthusiastic about Perl and not just use it as an add-on tool.
2015.11.30 in #229 Supporting the Perl Weekly?
Would you like to support the Perl Weekly? A Perl Job ad in the Perl Weekly, like the one above, will reach almost 6000 Perl developers. People like you, who are enthusiastic about Perl and not just use it as an add-on tool.
2015.12.02 in #228 Perl::Critic example - lint for Perl
2015.12.09 in #229 Array references in Perl
A tutorial on using array references in Perl 5.
2015.12.11 in #229 Counter with Dancer sessions
A short tuturial on creating a counter with the Dancer web framework.
2015.12.14 in #230 use Path::Tiny to read and write file
2015.12.17 in #230 shift in Perl
This areticle was published in response to a question on YouTube.
2016.01.01 in #232 The Popularity of Perl in 2015
Thought the title should be probably 'the popularity of Perl-related sites' based on 3 sources: Perl Weekly subscribers; Alexa, and Google Analytics of search.cpan.org, blogs.perl.org, MetaCPAN, and Perl Maven.
2016.01.02 in #232 Email validation using Regular Expression in Perl
While in a real application you'd probably use a module to validate the format of e-mail addresses, parsing them manually is actually a great way to teach regexes.
2016.01.03 in #232 Earn money with your Perl articles
Get in touch by e-mail for more details.
2016.01.09 in #233 How to read an Excel file in Perl
2016.01.19 in #235 Operations on value-pairs in Perl
List::Util has a couple of nice, and slightly surprising functions. For example: pairs, unpairs, pairkeys, pairvalues, pairgrep, pairfirst, and pairmap. Most of them act on pairs of values found in a list or array.
2016.01.22 in #239 Becoming a co-maintainer of a CPAN-module
Three new episodes in the series were re-published: Move packages to their own files, Finish Perl::Critic cleanup, set up Test::Perl::Critic, Eliminating indirect method calls. Enjoy, and support the Perl Maven by subscribing to the Perl Maven Pro
2016.01.23 in #235 Understanding regular expressions
2016.01.29 in #236 The easiest way to find the highest hash value without looping through all of them (max)
2016.01.31 in #236 How to provide STDIN to an external executable?
2016.02.01 in #237 Refactor the tests to use Test::More
As part of becomming a co-maintainer of Pod::Tree I have written a series of articles describing the process and published them for the Perl Maven Pro subscribers. It is time to re-publish them to the general public.
2016.02.05 in #237 Check test coverage - add compile tests
2016.02.10 in #238 Run Perl::Tidy to beautify the code
Gabor shows how you can use Perl::Tidy to ensure your code always followings your layout preferences, even if some of it was written by someone else.
2016.02.12 in #238 Use Path::Tiny instead of home-made ReadFile and WriteFile
When refactoring tests for a module, Gabor noticed functions for reading and writing files. He shows how you can use Path::Tiny for this, and also mentions File::Slurper, which is my go-to module for those tasks these days.
2016.02.18 in #239 An extra space can ruin your day
Space matters in Perl too
2016.02.23 in #240 Fixing the release. Twice in a row! (Pod::Tree 1.22 and 1.23)
Part of the series how to become a co-maintainer of a CPAN-module.
2016.02.26 in #240 Fix Perl::Critic test failures reported by CPAN Testers
What do you when you get failure reports from the CPAN Testers indicating Perl::Critic issues even though everything was fine on your machine.
2016.02.27 in #240 Ajax and Dancer 2
The beginning of a new series building a web application using Dancer as the back-end providing a JSON-based API.
2016.03.04 in #241 Perl::Critic exclude some policies - fix others
Gabor walks through running Perl::Critic at a certain level, while excluding some policies that you might not agree with, or be ready to deal with yet.
2016.03.12 in #242 Simple router with AngularJS
Not Perl, but it was originally published on the Perl Maven site and if you are interested in the full course, it will be given at YAPC::NA.
2016.03.14 in #243 Stand-alone Ajax client and the Access-Control-Allow-Origin issue
Part of the Dancer series.
2016.03.17 in #243 Logging in modules with Log4perl the easy way
Screencast and article.
2016.03.21 in #244 What is the status of the current test script?
Screencast from the Test Automation series
2016.03.22 in #244 Reverse Echo with Ajax and Dancer 2
Article from the Dancer 2 series
2016.03.25 in #244 Distribution directory layout
A screencast from the Advanced Perl Maven course.
2016.03.29 in #245 Separating test data from test code
A screencast and article showing how, once you have a stable test, you can move the test data to an external file and make it accessible to people who are 'domain experts' but not necessarily Perl programmers.
2016.03.30 in #245 How to return nothing (or undef) from a function in Perl?
The Perl Best Practices recommends to call return without any parameter instead of returning undef explictly. That's not always good though.
2016.04.03 in #245 Memoization - speeding up function calls by caching of return values
Memoization, which is basically a fancy name for caching, is not a new idea, but one that can be used in certain situations to speed up function calls.
2016.04.07 in #246 Prove, the harness
A tutorial on use of the prove utility to run your tests during development.
2016.04.11 in #247 Uploading files using Dancer
Dancer makes it quite easy to upload images and files to the server.
2016.04.16 in #247 Moving over to Test::More
A screencast from the Test Automation with Perl series.
2016.04.20 in #248 XML::Writer examples
2016.04.21 in #248 Test diagnostic messages using diag, note, and explain
2016.04.26 in #249 Refactoring Dancer 2 app, using before hook
2016.05.05 in #250 Silencing the noisy Dancer tests
2016.05.12 in #251 Prompt, read from STDIN, read from the keyboard in Perl
Part of the Perl tutorial.
2016.05.13 in #251 Why is Git better than Subversion for Open Source Projects
With a background story about Padre, the Perl IDE.
2016.05.15 in #251 YouTube Channel at 1,000 subscribers
Gabor's YouTube viewership is now in the four digits.
2016.05.18 in #252 Add and retrieve items - MongoDB, Dancer and Testing!
This screencast is part of the Dancer series.
2016.05.18 in #252 Almost infinite recursive template in AngularJS for representing tree structures
2016.05.21 in #252 TODO - testing a bug or a future feature
Gabor shows how you can mark a test as TODO, so it won't stop your distribution installing, but it lets people know that some work remains.
2016.05.27 in #253 Using 'like' to test without exact values
Screencast and article, part of the Test Automation using Perl series.
2016.05.28 in #253 CSV - Comma Separated Values and Perl
I needed a URL I can remember with a snippet of code I can copy and paste when I need to read a CSV file.
2016.06 in #260 Technology, Quality Management, Short Stories, History, and other Podcasts
Just a list of recommended podcasts and how Gabor mixes those with outdoors activity and driving.
2016.06.01 in #254 Private Member Data shouldn't be accessed directly - encapsulation violation
Another useful rule that did not make into the core of Perl::Critic.
2016.06.03 in #254 Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
undef in a Test::Deep regex
2016.06.03 in #254 Why am I blogging?
Blogging, freefall flaming sword juggling, deep-sea abstract painting. Why some people feel compelled to do those things?
2016.06.06 in #255 Testing timeout with cmp_ok
It is easy to check equality using the 'is' function of Test::More, but how can you check if a number falls between two values? (screencast+article)
2016.06.11 in #255 Set minimum version number in every Perl file
Use the Compatibility::PerlMinimumVersionAndWhy policy of Perl::Critic
2016.06.15 in #256 Three-argument form of open used and it is not available until perl 5.6
Hopefully we all know now why we should use the three argument version of open(). But if you do, you really should include use 5.006; in your code.
2016.07.02 in #258 Add and retrieve elements using jQuery + Ajax
Pert of the Dancer2 series building an Ajax-enabled application, this article shows the client-side JavaScript code.
2016.07.12 in #260 Speed up calculation by running in parallel
Use fork and Parallel::ForkManager to spread load to multiple CPUs.
2016.07.18 in #261 Gabor's YAPC::NA report
Gabor's notes from YAPC::NA.
2016.07.23 in #261 Comparing complex data-structures using is_deeply
How to compare complex data structures in your test cases, using the is_deeply function from Test::More.
2016.07.28 in #262 Deleting item using Ajax request with DELETE and OPTIONS
An episode in the Perl Dancer series that was first published a year ago for the Perl Maven Pro subscribers.
2016.08.06 in #263 Is this IP in the given subnet?
A very nice article & video explaining the usage of Net::Subnet & its pitfalls
2016.08.15 in #264 Core Perl OOP: Constructor
Screencast and article explaining how to create an object using 'bless'.
2016.08.15 in #265 Core Perl OOP: attributes, getter - setter
Screencast explaining getter-setter in core Perl OOP & Moose.
2016.08.16 in #265 Analyzing web application usage
Gabor asked how do you analyze your web application usage, if you have anything to say then please comment on the reddit thread.
2016.08.22 in #266 What should setters return? (Examples with core Perl OOP)
Should it return undef? The newly assigned value? The previous value? The object itself?
2016.08.31 in #267 Forget your plan, just call done_testing
Most Perl 5 testsuites start off by stating how many tests are expected to run; Gabor shows that you don't have to do this, and sometimes that's the easiest way to go.
2016.09.07 in #268 Multiple expected values - testing dice
2016.09.09 in #268 Replace manual HTML generation by the use of Handlebars
2016.09.12 in #269 Implementing 'is_any' to test multiple expected values
In continuation with his previous post, Gabor explains how to implement is_any function to test multiple expected values.
2016.09.17 in #269 Add a date stamp to the items in the database
2016.09.23 in #270 Convert list to table and add jQuery tablesorting with Date column
Part of the Perl Dancer series.
2016.09.25 in #270 Creating a testing module
Part of the test automation with Perl series. (screencast)
2016.09.28 in #271 Basic Authentication with LWP::UserAgent and HTTP::Request::Common
2016.09.30 in #271 Test::Builder object explained
2016.10.04 in #272 Keep data in client and fetch only changes
Front-end code-improvement for the Dancer Ajax project.
2016.10.07 in #272 Organizing a test script with subtests
subtest make it easier to keep your plan intact. (screencast)
2016.10.11 in #273 Improve your chances of survival at Job Interviews and Public Speaking
Some tips on how to prepare yourself for speaking.
2016.10.14 in #273 Jan Henning Thorsen and Marcus Ramberg about Convos, the web-based IRC client
Convos is built on Mojolicious. You can easily set up an in-house web-based chat system, without people even knowing they use the in-house IRC behind.
2016.10.15 in #273 Test for expected warnings
Gabor shows how you can use Test::Warn to test your module for warnings you expect it to emit in certain situations.
2016.10.20 in #274 Missing and outdated CPAN modules in Ubuntu (Debian)
Gabor pointed out that some CPAN modules are missing/outdated in Ubuntu. Reddit thread tells us that there are more. May be lend a hand to Debian Perl group
2016.10.21 in #274 Moose constructor
2016.10.24 in #275 Open Source Conferences
A list of upcoming Open Source related conferences. Many of them still with open call for papers. The source is in GitHub.
2016.10.29 in #275 Moose: Testing the constructor
Screencast
2016.11.11 in #277 Moose: testing the setter and getter
2016.11.11 in #278 Moose type constraints
2016.11.20 in #278 Perl Blaster - get selected videos in your inbox
If you are overwhelmed by the number of online talks, then sign up for Gabor's newsletter to get a refined list of talks.
2016.11.23 in #279 Moose testing type constraint
2016.12.09 in #281 Classes as constraints in Moose
2016.12.19 in #282 Creating subtypes for Moose
Another episode from the old Moose series.
2016.12.19 in #283 What is @INC in Perl?
2016.12.27 in #284 Moose: coerce value to a subtype
Gabor introduces type coercion in Moose.
2017.01.03 in #285 Perl 4 libraries
2017.01.06 in #285 The problem with Perl 4 style libraries
2017.01.11 in #287 Namespaces and packages in Perl
2017.01.14 in #287 Modules in Perl
2017.01.15 in #287 Perl events calendar
You can find more than 200 conferences on the Code And Talk site. 3 of them are Perl-specific and one of them has a Perl track.
2017.01.22 in #287 How does require find the module to be loaded?
2017.01.27 in #288 What is the difference between require and use in Perl? What does import do?
(video)
2017.01.27 in #289 Exporting and importing functions easily
(video)
2017.02.17 in #291 Restrict the import by listing the functions to be imported
Gabor shows how to import just the functions you're going to use, when use'ing a module.
2017.02.21 in #292 Import on demand
Anotother entry published from the the Advanced Perl videos series that was earlier only available to paying members of the Perl Maven site.
2017.02.24 in #292 Always use warnings in your Perl code!
In almost every place where Perl is written by people who are not connected to the Open Source Perl community, they still need to be convinced of the advantages of 'use warnings'. Here you can find a number of examples of what could go wrong if you did not have 'use warnings' in your code.
2017.02.26 in #292 Testing my tests
This is a question: Is there some tool for Perl that would randomly change the AUT and run the tests effectively trying to figure out if the tests would catch those changes?
2017.03.01 in #293 Modules - Behind the scenes
Gabor has a look at some of the core modules that are shipped with Perl itself.
2017.03.04 in #293 Tools to package Perl scripts, modules, and applications
Gabor goes through some of the tools you can use to package your code, for CPAN, or not.
2017.03.09 in #294 Tools to package Perl scripts, modules, and applications
Part of my effort to publish the Perl Advanced videos I recorded a couple of years ago, here are two: Makefile.PL of ExtUtils::MakeMaker and Makefile.PL of Module::Install
2017.03.18 in #295 Current working directory in Perl (cwd, pwd)
Gabor introduces the Cwd module, and shows the differences between the cwd() and getcwd() functions.
2017.03.21 in #296 MANIFEST and MANIFEST.SKIP
Another episode (re)published from the Advanced Perl series that was part of the Perl Maven Pro.
2017.03.25 in #296 Perl related crowdfunding on Kickstarter and ?
Crowdfounding is not exactly a grant, but can be a good way to partially finance some work.
2017.03.25 in #296 Getting started with Rakudo Perl 6 in a Docker container
Just saying Hello World with Perl 6 using the official Docker image.
2017.03.28 in #297 Packaging a Perl script and a Perl module
2017.03.29 in #297 Encrypting Passwords in Perl 6 using crypt
Not a recommendation to use crypt, just a description of an algorithm.
2017.04.02 in #297 Traffic origins of search.cpan.org
2017.04.05 in #298 Packaging with Build.PL
Another old video was republished.
2017.04.07 in #298 Encrypting Passwords in Perl 6 using crypt and SHA-512
Still not the perfect solution for encrypting passwords, but better than the previous one.
2017.04.08 in #298 A test file in Perl
Part of the advanced Perl series.
2017.04.14 in #299 Exception handling in Perl: How to deal with fatal errors in external modules
2017.04.16 in #299 Benchmarking crypt with SHA-512 in Perl 6
As Crypt::Bcrypt is still not installable, making the SHA-512 slow is the best alternative we have.
2017.04.19 in #300 Core Perl OOP: Constructor arguments
2017.04.19 in #300 No Silver Bullet podcast
The first episode of the new podcast by Gabor: How do other companies create high-quality sotware?
2017.05.01 in #301 Blog engine in Perl 6
Yours truly is looking for feedback for the blog engine plan. Both for the technical requirements and for the way to conduct a crowd-funding campaign.
2017.05.02 in #302 Generate Random Text with Perl using Text::Lorem
Just an example.
2017.05.13 in #303 Serving static site using Plack and PSGI
A simple example using Plack::App::File and Plack::Middleware::DirIndex
2017.05.21 in #304 Web Application Development in Perl 6
Crowd funding for a book about Web Application Development in Perl 6
2017.05.29 in #305 Crowdfunding the Bailador book
Gabor continues his crowdfunding campaign to write a book on Web Application Development in Perl 6. He has posted an article on launching the campaign and the first week of the campaign. Bailador now has a web site.
2017.05.31 in #306 Book: Web development in Perl 6
This is the crowdfunding campaign of my book about Bailador, the light-weight route-based web application development framework of Perl 6.
2017.06. in #308 Batteries included - the biggest impact on programming language popularity
2017.06.06 in #307 Blog engine in Perl 6
Gabor is working on a blogging engine in Perl 6, as one of the examples for his book on web application development in Perl 6.
2017.06.18 in #308 Bailador Plans
Read about some plans with the Bailador Project and remember, you have only 3 days left to support the book.
2017.06.22 in #309 Extending the Bailador crowdfunding campaign by another month
Let's give more people and also companies the opportunity to support the Bailador book.
2017.06.24 in #309 Testing PSGI based web applications using Plack::Test
2017.07 in #314 Echo with Plack in CGI mode
2017.07.07 in #383 Hello World with plain CGI
2017.07.12 in #312 Echo with plain CGI
Removing CGI.pm from core Perl did not stop people from wanting to use it. It did not make it less useful, just harder to use. People still ask for help getting started with CGI.
2017.07.13 in #312 Why am I writing the Bailador Book?
2017.07.15 in #312 LWP::Simple - a simple web client in Perl 6
2017.07.30 in #315 Continuous Integration for Perl 6 modules
The modules list of Perl 6 now show both the Travis-CI and Appveyor status of the modules where those are enabled. For the modules that the Continuous Integration is not running yet you can find a link explaining how to set that up. 2 Days ago Appveyor stood at 40. Today at 59. It is now your turn to help the Perl 6 modules run on Windows. UPDATE: The site was updated. It looks much better now, but I am not sure if you can easily find the modules that need help with Appveyor or Travis-CI configuration.
2017.08 in #318 How to forbid certain Perl modules from use?
Using Perl::Critic you can create a list of 'forbidden modules' and even recommend alternatives. This can be very useful in a large team to direct people to the modules recommended by you.
2017.08.27 in #318 Why to have Public Version Control System for Open Source Projects?
2017.09 in #321 Perl Dancer eBook Crowdfunding campaign
Check out the book-cover or go straight to the crowdfundig page
2017.09 in #323 Bumping version numbers in all the modules at once
2017.09.02 in #319 Developer Weekly Newsletter
Gabor is starting another weekly newsletter: this one is going to provide a curated selection of blog posts published by major tech companies. You can sign up at developer-weekly.com.
2017.09.05 in #320 How to get a slice of a hash?
2017.09.12 in #321 Bailador 0.0.12 released and the Bailador Book is progressing
Just updating you on the progress.
2017.09.12 in #321 Possible precedence issue with control flow operator
A relatively new warning in Perl that can help you catch a subtle bug in the code.
2017.09.26 in #323 Perl Dancer eBook: Angular, React, or Vue?
The Perl Dancer eBook was founded and it will be written using jQuery. If you'd like to still support it go ahead. If we reach $7,000 you will get another front-end in the book. Angular, React, or Vue.

2017.10.03 in #324 How to promote a new web site - how to get visitors
2017.10.10 in #325 Fixing test failure on Windows - Properly quoting regexes - Accepting GitHub pull request
2017.10.22 in #326 Perl Infrastructure
What kind of infrastructure is behind the Perl-related web sites? Who are the contact people?
2017.10.30 in #327 Split retaining the separator or parts of it in Perl
2017.11.05 in #328 String eval
2017.11.12 in #329 Testing a tree data structure in Perl
2017.11.13 in #330 Microservices
Recently I was asked to explain what Microservices are. BTW Did you know about Cro the framework for Microservices in Perl 6?
2017.11.16 in #330 Show number of files in a directory tree using Shell
2017.11.19 in #330 Search for hash in an array of hashes
How can you find a hash with a specific key-value pair in an array of hashes? What if you are expecting to find more than one matching items?
2017.11.21 in #331 Show number of files in several directory trees using Shell
2017.11.22 in #331 Have exceeded the maximum number of attempts (1000) to open temp file/dir
A not too common, but rather annoying error.
2017.11.29 in #332 Removal of the current directory (".") from @INC in Perl 5.26 and Travis-CI
2017.12.04 in #332 50% discount on the Bailador Book
2017.12.07 in #333 Open file to read and write in Perl, oh and lock it too
(this was actually added by Upasana herself :)
2017.12.07 in #333 Patreon for Gabor
This was really added by Gabor: Patreon allows you to support a great author, a creator, or yours truly with a monthly patronage of 1, 2, 3, 5, 8... USD. My first goal is to get started with this. With your help I hope to reach it very soon so I can go on to the next goal that will be updating the whole Perl Maven tutorial.
2017.12.12 in #334 Modulino: both script and module in Perl
Sometimes you'd want to allow people to use the functions from your script and sometime you'd like to run your module as if it was a script. Based on the comments on the article and on Reddit, not everybody liked, but I learned that the word was actually coined by brian d foy. I also got some ideas for more use-cases.
2017.12.13 in #334 Patreon and Perl
Patreon allows you to support people with a small monthly payment.
2017.12.16 in #334 Bailador + Dancer SPA + Collab dev bundle
As a Christmas special I am also offering my 3 books in a bundle at a very deep discount.
2017.12.20 in #335 Self testing Perl modules using the Modulino concept
2017.12.24 in #335 Bailador + Dancer SPA + Collab dev = 3 eBooks for the price of one
Just this week.
2018.01 in #341 Sorted hash in Perl using Tie::IxHash
2018.01. in #339 Test Automation Using Perl
2018.01.02 in #337 each - iterate over Perl hash elements pair-by-pair
2018.01.05 in #337 Perl Programming
I have moved my Perl Programming slide to a new URL.
2018.01.08 in #337 New Year's resolutions are the Waterfall methodology
2018.01.10 in #338 Testing Perl CGI application
Unfortunately CGI.pm was removed from Perl, but still many sites use it. This is a simple way to test simple CGI-based applications.
2018.01.21 in #339 Getting Started with Perl::Critic (the linter for Perl)
Perl::Critic can help you potential bugs or just make your code more maintainable.
2018.01.23 in #340 Getting started with Perl on Docker
Docker allows you to create a Linux environment standardized for your project. It makes it super easy to ensure the same environment across all the developers and even in production.
2018.01.26 in #340 How to splice a CSV file in Perl (filter columns of CSV file)
2018.01.28 in #340 Would you like to be a Patr[e]on?
Some people have a single source of income, but then most of what they create belongs to that company. I'd prefer to have a 1,000 patrons who each give a few dollars a month and make most of my work available to everyone. Via Patreon or via PayPal
2018.02.02 in #345 Start writing the Markua parser in Perl
Markua is a Makrdown-inspired language for writing books created by LeanPub. In this article series I am going to explain how I build a Markua Parser in Perl. I need it to make it easier to generate ebooks from the content of the Perl Maven web site.
2018.02.06 in #342 How to change directory (chdir, cd) in Perl?
2018.02.11 in #342 DevOps
A collection of DevOps related topics and the technologies related to them.
2018.02.16 in #343 The Popularity of Perl in 2018 February
The numbers don't look very good though according to David Farrell the perl.com visitors numbers are exploding. I also hope the updating of the Perl Maven Tutorial will have a positive impact.
2018.02.19 in #343 Crowd funding: Updating the Perl Maven Tutorial
I am starting a crowd funding campaign that will allow me to allocate some time to update the Perl Maven Tutorial. Your support would be appreciated.
2018.02.20 in #345 Why does this code not work? (split, array slice)
A problematic piece of code and a solution. If you would like to see it.
2018.02.26 in #344 Updating the free Perl Maven tutorial
Last week I launched a new crowdfunding campaign to provide me with some time and encouragement to update the Perl Maven Tutorial. It had a very good start, but I'll need a lot more people to support it. If for nothing else, to see that you think it is valuable to you or to the Perl community in general. ~ Gabor
2018.03.04 in #345 Ansible
The beginning of a series on using Ansible for Configuration Management
2018.03.05 in #346 Travis-CI for the Markua Parser project
Markua is a Markdown-inspired language for writing books created and used by LeanPub. The Markua parser in Perl 5 was started by yours truly to make it easier to use Markua for writing the articles on the Perl Maven site and then to convert them to eBooks. This article shows how to set up Continuous Integration on Travis-CI. The whole project was started to aid the work once the Perl Tutorial Campaign is successful.
2018.03.06 in #346 Help improving the Perl Maven Tutorial!
You can help the Perl Maven Tutorial and through that many beginner Perl developer either with the content or with the crowdfunding.
2018.03.08 in #346 Add test coverage reporting with Coveralls to Markua Parser in Perl
Another step in the Markua parser project to help the Perl Tutorial crowdfunding.
2018.03.14 in #347 Ansible on Ubuntu in VirtualBox environment - using Python 3
2018.03.15 in #347 Enable Appveyor (CI on Windows) for the Perl 5 Markua Parser
2018.03.21 in #348 Installing Perl and CPAN modules using Ansible
2018.03.29 in #350 Creating a Markua Parser in Perl 5
I've made a lot of progress in the Markua parser and the eBook describing the development process. It became a nice case-study in Test Driven Development and you can get it for almost nothing.
2018.03.30 in #349 Interviews with Perl Developers
10 Interviews with Perl Developers from 2013. Now listed on one page.
2018.04.08 in #350 Useless use of hash element in void context
Just an example for code that can generated the above warning.
2018.04.16 in #351 Profiling part of a Perl application
An example using Devel::NYTProf
2018.04.17 in #352 How to run the tests of a typical Perl module
One of the obstacles in contributing to a Perl module is to know how to get started and how to verify that your changes are correct. Not any more. This article shows how to run the test of a module checked out from its GitHub repository.
2018.04.19 in #352 Variable number of parameters in Perl subroutines
How to implement a subroutine like 'sum' where any number of parameters can be passed and they are 'all the same'.
2018.04.20 in #352 Refactoring Perl code
2018.04.25 in #353 readline() on closed filehandle in Perl
A new entry in the Common Warnings and Error messages in Perl series in which I give examples of code that trigger specific warning and errors in Perl together with alternative explanations.
2018.04.28 in #353 slurp mode - reading a file in one step
How can you find a string in a file that might start on one line and end on another line? It would not be easy to do it if we read the file line-by-line.
2018.05.05 in #354 Introducing CI/CD, Test Automation to your team
Besides editing the Perl Weekly newsletter and writing articles on the Perl Maven site, I also offer services to companies helping them improve their development practices. Primarily I help introducing Test Automation systems (Unit ~, Integration ~, Acceptance tests.) Setting up CI/CD systems. Virtualization. Cloudification. Almost all of my clients came through referrals by people like you. Members of the Perl community. So if your team or company is interested in such a move, you know where to find me.
2018.05.05 in #354 Out of memory!
What really happens if your process tries to use more memory than is available in the computer? An experiment.
2018.05.05 in #354 Using a queue in Perl
Queues are one of the fundamental data structures in the programming world. Here is an example using Perl.
2018.05.05 in #354 Strings in Perl: quoted, interpolated and escaped
2018.05.05 in #357 Introducing CI/CD, Test Automation to your team
If you fight with legacy code and you think there could be a better way, let me assure you there is. You could write tests. You could set up Continuous Integration. You could work much faster and much safer. If you need help with that, talk to me. I offer such help as a service. Both for Perl and for other languages.
2018.05.07 in #355 Split up and flatten a CSV file
I wonder if this was a real task or just the homework assignment of someone and if I've ruined the homework of some Perl teacher now by publishing an answer...
2018.05.20 in #356 How to change @INC to find Perl modules in non-standard locations
2018.05.27 in #357 Command line counter with Memcached
Part of the Counter examples series, a simple example using Memcached.
2018.05.27 in #357 Groovy
Groovy is a JVM based programming language. These few articles are the beginning of a longer Groovy series.
2018.05.27 in #358 Command line counter with Memcached
Part of the Counter examples series, a simple example using Memcached.
2018.06.03 in #358 Groovy
Several new articles were added to the Groovy series.
2018.06.05 in #359 Using Rakudo Perl 6 in a Docker container
Short examples.
2018.06.10 in #359 Do you want to make your developers faster?
Introduce testing. Set up Continuous Integration. Refactor your code. Gabor, the editor of the Perl Weekly, can help you with any of these in Perl, Python, and other languages. Even remotely.
2018.06.10 in #359 Craft Conf 2018 retrospective
2018.06.10 in #360 Do you want to make your developers faster?
Introduce testing. Set up Continuous Integration. Refactor your code. Gabor, the editor of the Perl Weekly, can help you with any of these in Perl, Python, and other languages. Even remotely.
2018.06.11 in #359 SQLite in Memory
A simple example in Perl using an in-memory version of SQLite for when you'd like to use SQL statements, but don't need to store the data on the disk.
2018.06.11 in #360 SQLite in Memory
A simple example in Perl using an in-memory version of SQLite for when you'd like to use SQL statements, but don't need to store the data on the disk.
2018.06.23 in #361 Useless use of private variable in void context
The Useless use of hash element in void context warning that you might get if you follow my suggestion and turn on warnings in Perl.
2018.07.01 in #362 Git workflow for individuals
2018.07.02 in #362 Data Serialization in Perl
2018.07.07 in #363 Multi dimensional arrays in Perl
2018.07.09 in #363 RnD at WeWork
The first entry of a new series on the Code Maven web site trying to understand how RnD works in various hi-tech companies. The first entry is about WeWork.
2018.07.12 in #364 R&D at Graduway
A new episode of the R&D at $company series. Graduway is a small company that provides SaaS products aimed at universities, schools, enterprises, and other organizations.
2018.07.14 in #364 Accessor with type constraint
An older screencast about accessors with Moose.
2018.07.22 in #365 Class as type constraint
Screencast and code snippets.
2018.08 in #368 Enforcing commit message format in Git - on the client side
2018.08.04 in #367 Can't use string (...) as an HASH ref while "strict refs" in use at ...
2018.08.13 in #368 Perl Regex superpowers - execute code in substitution - what are /e and /ee ?
2018.08.15 in #369 Enforce fast forward as merge strategy in Git
2018.08.20 in #369 How to write to the beginning of a file?
2018.08.22 in #370 Jenkins-related articles
Jenkins CLI: create node and Jenkins Pipeline: Add some text to the job using shortText and Jenkins Pipeline: Send e-mail notifications
2018.08.25 in #370 Increase numbers in a file
2018.08.30 in #371 Strings in Perl: quoted, interpolated and escaped
2018.08.30 in #371 gcloud and aws
The Code-Maven site is used as my external persistent memory. I push out code snippets and command snippets that were useful for me. This time some command using the CLI interface gcloud and aws
2018.08.31 in #371 7 of the most useful Perl command line options
I've published this article to give people some pointers, to which I got a few "interesting" comments, including Dave Cross pointing to his 14 years old article which is longer and brian d foy who then posted his additions that also got some "interesting" comments. I did not know that command line options are such a popular topic. Almost competing with opinions about editors and indentation.
2018.09.09 in #372 Testing for no warnings in Perl
2018.09.15 in #373 tmux a terminal multiplexer
I am surprised how many people don't use any terminal multiplexer. So here are my notes.
2018.09.15 in #373 Memory use of sparse arrays in Perl
How much memory does this use? my @a; $a[1_000_000] = 1;
2018.09.15 in #373 Create Digital Ocean Droplet using Terraform
2018.09.24 in #374 Common Warnings and Error messages in Perl
2018.10.08 in #376 Simple Database access using Perl DBI and SQL
2018.10.14 in #377 How to improve my Perl program?
2018.10.27 in #379 Sudoku in Perl
2018.11.04 in #380 Getting Started with Perl::Critic (the linter for Perl)
2018.11.11 in #381 (Test) Automation - CI - CD - DevOps
As you might know my day-job is to help teams improve their development process by introducing Test Automation, CI/CD and other DevOps practices. Mostly I work with local customers, but I have started to work with a remote client and I wish to expand this. So if you feel your organization could get some boost in that area, get in touch with me.
2018.11.11 in #381 Scalar value ... better written as ...
2018.12.07 in #385 Distributing a Perl script using Docker container
One way to distrubute a Perl script embedded in a Docker image.
2018.12.21 in #387 Perl Critic reports
2018.12.29 in #388 Dancer in Docker
An example to create a Docker for Dancer 1 running on system Perl.
2018.12.30 in #388 Perlbrew on Linux (Ubuntu 18.10)
A partially successful experiment to use perlbrew supplied by Ubuntu.
2019.01 in #391 Functions in Bash
Just a few examples on how to use functions in Bash
2019.01 in #393 Limit Bitbucket pipelines to specific branches
Pipelines is the name of the CI SASS solution Bitbucket provides. Here are some configuration tips.
2019.01.18 in #391 Ranking of Perl sites
2019.01.20 in #391 Reading configuration INI files in Perl
How to read an INI file in Perl?
2019.01.23 in #392 The importance of using HTTPS
2019.01.30 in #393 CSV_XS ERROR: 2034 - EIF - Loose unescaped quote @ rec 5 pos 194
An error and how to fix it.
2019.02.16 in #395 A bunch of Perl one-liners to edit HTML files
I know some people will react to this with an automatic response 'never parse HTML with regex'. I wonder though, why talk in absolutes? Isn't it possible that someone might have special cases where the rule can and maybe even should be bended? Asking for a friend.
2019.02.16 in #395 Jenkins
Several new articles were published in the Jenkins series
2019.02.27 in #397 Using the Open Weather Map API with Perl
I like preparing simple, but full examples that can work out of the box. That's why I prepare them when I have the time.
2019.03. in #398 Reading the content of a directory
2019.03.17 in #399 Fast lookup by name or by date - Array - Hash - Linked List
How to design a data structure? That's one of the hard questions in computer science and the answer is: It depends on the usage.
2019.03.24 in #400 substr outside of string at ...
2019.03.31 in #401 Use of implicit split to @_ is deprecated ...
2019.04 in #403 Groovy
Many new entries in the Groovy series
2019.04.07 in #402 Reading and writing binary files in Perl
2019.04.12 in #403 min, max, sum in Perl using List::Util
2019.04.16 in #404 Hash of Arrays in Perl
2019.04.19 in #404 Getting started testing Perl module with Test2
2019.04.22 in #404 Groovy
Many Groovy-releated articles were publish this week.
2019.04.26 in #405 Perl Dancer examples
While for new project you should use Dancer 2 I am currently dealing with an application that is in Dancer 1 so I wrote a couple of examples. I was especially interested writing examples on how to test a web application written in Dancer as having tests allows us to move faster and it allows us to switch to Dancer 2 withot the fear of breaking the system and noticing only after deployment.
2019.04.27 in #405 CLI - Command Line Interface in Perl
A few points on CLI in Perl along with a new post about GUIs in Perl.
2019.04.29 in #406 Upgrading perl on Linux or OSX - installing perl using perlbrew without being root
2019.05.06 in #407 Debugging compile time code (debugging BEGIN block)
It is not a good practice to put a lot of code in a BEGIN block or in the body of a module that gets executed at compile time, but we have all encountered code like that. How can you debug such code?
2019.05.06 in #407 Add (conditional) debugger breakpoints to your code
What if you have a loop that you'd like to debug but only after it passed 10,000 iterations? Use conditional breakpoints.
2019.05.16 in #408 Merge hashes of arrays
2019.05.17 in #408 qx or backticks - running external command and capturing the output
2019.05.27 in #406 Prompt for user input using IO::Prompter
2019.09.13 in #425 Use the same sub as function or as method in Perl
2019.09.30 in #427 Hacktoberfest 2019 and Perl
Some low-hanging fruits of PRs that can help improve the overall health of the CPAN ecosystem.
2019.10.16 in #430 Write YAML file
Just a simple example to copy-paste.
2019.11.03 in #432 Read a YAML file and load it into memory
2019.11.09 in #433 File modify date - When was a file last changed?
2019.11.12 in #434 Epoch - The creation of the world
2019.11.12 in #434 Enable Travis-CI for Continuous Integration
2019.11.19 in #435 Counter example using YAML file to store the data
2019.11.26 in #436 How to print elements of an array in reverse order in Perl
2019.11.28 in #436 CI notification strategy
2019.12.07 in #437 Process the 6 headers of Markua
Parsing Markua, the magical typewriter.
2019.12.07 in #437 Gabor self reporting for 2019.11
2019.12.16 in #438 Exchange values and keys of a hash - how to reverse a hash
2019.12.19 in #439 Collecting errors while parsing Markua in Perl 5 - disregarding empty rows
2019.12.24 in #440 Meetups: Presentations and workshops
2020.01.01 in #441 Gabor self reporting for 2019.12
2020.01.18 in #443 Marketing and promotion
2020.01.26 in #444 Refactor test cases of the Markua Parser in Perl 5
Another part of the Markua parser series was released.
2020.02.02 in #445 Get Coveralls to notify when test-coverage shrinks
Part of the Markua processing series. (Markua is Markdown for writing books.)
2020.02.03 in #445 First impression with Raku
2020.02.29 in #449 Consider everything not recognizable as a paragraph in Markua
Another entry in the Markua parser in Perl series.
2020.03 in #450 Markua resources: Include files
2020.03.13 in #450 Test Automaton Engineer
Many companies are looking for 'Test Automation Engineers' or 'QA Automation engineers' or just 'Automation engineers'. In this post I tried to give you some insight to what you need in order to become one.
2020.03.14 in #451 Test coverage report with Devel::Cover for the Markua Parser

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