In Part 1, I compared Perl’s regexp features with sed and Awk. In this concluding part, I’ll cover examples that make use of Perl’s extensive built-in features and third-party modules.

Perl has a much bigger collection of built-in functions compared to Awk. For command-line usage, I often need tr, join, map and grep. I like that arrays and hashes are distinct in Perl and applying sort on these data types is much simpler compared to Awk.

This problem wants to append columns to rows that have too few, like the b, c and d rows:

a,10,12,13
b,20,22
c,30
d,33

This app…

A shell (like Bash) provides built-in commands and scripting features to easily solve and automate various tasks. External commands like grep, sed, Awk, sort, find, or parallel can be combined to work with each other. Sometimes you can use Perl either as a single replacement or a complement to them for specific use cases.

Perl is the most robust portable option for text processing needs. Perl has a feature rich regular expression engine, built-in functions, an extensive ecosystem, and is quite portable. However, Perl may have slower performance compared to specialized tools and can be more verb…

[This article is part of our Popular articles project to update Perl.com for contemporary practices]

If you’re reading this article, you’re likely looking for a simple way to download and install the Perl programming language. Or you already have Perl installed as part of your operating system, but it’s older than the currently-supported versions (5.32.1 or 5.30.3) and you’d like to use the latest and greatest features. The download options may seem daunting, especially if you’re new to computers or programming. We’ll take things step by step, and soon you’ll be on your way to…

Paul “LeoNerd” Evans is a CPAN author, blogger, and core Perl contributor. He introduced the experimental isa operator in Perl 5.32 and the try/catch syntax in an upcoming version.

Lets see—I’m going to do this in reverse chronological order.

Currently I’m a self-employed contractor, splitting my time between Perl and other computery things, and electronics. Most of the jobs I’ve had before I did that were based on Perl, with the minor exception of a little Internet startup company called &ldqu…

Before I became a computer programmer, I tried my hand at being a human programmer, in the form of a wordsmith, as I called myself then. I had various jobs as a writer, editor, translator and journalist, but I met with little success, for two main reasons. In those days you needed a publisher to find your work interesting enough to publish before anyone could read it, and that was a pretty high bar. And in the second place, it was difficult to get the humans to react to the content I wrote (I’m still exercised that the movie reviewer would get more letters to the editor than I did after…

For a week we lost control of the Perl.com domain. Now that the incident has died down, we can explain some of what happened and how we handled it. This incident only affected the domain ownership of Perl.com and there was no other compromise of community resources. This website was still there, but DNS was handing out different IP numbers.

First, this wasn’t an issue of not renewing the domain. That would have been a better situation for us because there’s a grace period.

Second, to be very clear, I’m just an editor for the website that uses the Perl.com domain. This means that I’m…

These are some answers to the Week 164 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a few of days from now (on May 15, 2022 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

Write a script to find all prime numbers less than 1000, which are also palindromes in base 10. Palindromic numbers are numbers whose digits are the same in reverse. For example, 313 is a palindromic prime, but 337 is not, even though 733…

The open or die idiom is fairly ubiquitous in Perl. To be useful, the exception should say something about what went wrong: open ... or die "Open error: $!", for example.

The $! built-in variable (a.k.a. $ERRNO or $OS_ERROR if use English; is in effect) gives you access to the C language errno variable, which through the magic of Perl interpolates an error message appropriate to the error given.

But there are times when some error analysis is in order. Fortunately, $! is a dualvar, so if you access it in numeric context rather than string context, you get the actual numeric value of the error co…

Hello everybody,

after a long time of waiting it is finally time - we cordially invite you
to the German Perl/Raku Workshop 2023.

Next year's workshop will take place from Monday 28 February to
Wednesday 1. March in the Saalbau Gallus in Frankfurt am Main.

The website and the call for papers are already online at
https://act.yapc.eu/gpw2023/cfp.html . We are looking forward to many interesting
presentations!

Of course, we also do not know if the Covid-19 situation will allow us to
to hold the workshop as usual. However, we hope that despite the
we will have an exciting event.

We are always happy about s…

These are some answers to the Week 163 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a few days from now (on May 8, 2022 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

You are given list positive numbers, @n.

Write script to calculate the sum of bitwise & operator for all unique pairs.

Example 1:

Input: @n = (1, 2, 3)
Output: 3

Since (1 & 2) + (2 & 3) + (1 & 3) => 0 + 2 + 1 =>  3.

Example 2…

These are some answers to the Week 162 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a couple of days from now (on May 1st, 2022 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

Write a script to generate the check digit of given ISBN-13 code. Please refer wikipedia for more information.

Example

ISBN-13 check digit for '978-0-306-40615-7' is 7.

This how Wikipedia describes the calculation of the ISBN-13 check digit:

Appendi…

These are some answers to the Week 161 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a couple of days from now (on April 24, 2022 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

An abecedarian word is a word whose letters are arranged in alphabetical order. For example, “knotty” is an abecedarian word, but “knots” is not. Output or return a list of all abecedarian words in the dictionary, sorted in decreasing…

[Update: the CPAN Request Tracker was saved. It’s now run by a new team of volunteers and none of my suggestions below are required.]

Two weeks ago, we learned that the CPAN Request Tracker was closing down early next year. I proposed a plan that CPAN authors could follow to ensure that their users can still find somewhere to report bugs in modules (and, perhaps more importantly, to see what bugs have already been reported in modules).

But that’s only part of the problem. In fact, it’s probably a minor part of the problem. If you’re an active CPAN author, then you probably already knew about the…

CPAN RT is going away. CPAN authors have until the beginning of March to extract any useful information from it.

RT is the “Request Tracker”, a bug tracking system that is written by Best Practical. For almost as long as I can remember, anyone who uploads a module to CPAN gets a free ticket queue for their module at rt.cpan.org. MetaCPAN assumes that’s where people should report bugs in your module and helpfully adds an “issues” link that goes to the appropriate page in RT.

But now that system is going away. It will be switched off on the 1st March 2021. The Perl NOC team is spread pretty thinly…

Blog posts are like busses. You wait months for one and then two come along on consecutive days!

Yesterday I wrote about how we didn’t need a blogging platform for the Perl community – all we really needed was a good-looking feed aggregator. I mentioned Perlsphere as one such aggregator.

Then Matthew commented, saying that Perlsphere looked a bit broken as Dave Cantrell’s posts from a few years ago frequently pop up there as new posts. I had a quick look at the problem and couldn’t quite work out what was going on. His web feed seems valid, but Perlsphere didn’t seem to recognise the dates of th…

I think it was at YAPC Copenhagen in 2008 that a small group of us first discussed the idea of building a shared blogging platform for the Perl community. It was over a year later that we launched blogs.perl.org.

I remember a lot of discussions over that time where we tried to thrash out exactly what we wanted to build. I know that one of my main drivers was that I wanted to replace the journals feature of use.perl. For those of you too young to remember, use.perl was a Perl community web site from the dawn of time. The site ran Perl news on its front page, but users could also have their own j…

What do you do when you’re stuck inside because Coronavirus means that your country is in lockdown? Well, you write a book, of course. Or, to be more accurate, you cobble together fifty or so old blog posts into a book.

So that’s what I’ve done. Now you can read some of your favourite Perl Hacks blog posts in a handy Kindle book. Other ebook marketplaces are, of course, available – but I haven’t had the time to make a version that’s available from anywhere else yet. That might follow if enough people ask for it.

The book is, predictably, called The Best of Perl Hacks and it’s available from Amaz…

Last week I was in Riga for this year’s European PerlCon (the conference formerly known as YAPC::Europe). As has become traditional, here’s my report of the conference.

My conference began on Tuesday night at the pre-conference meet-up. Most people get into town on the night before the conference starts and the organisers always designate a local bar as a meeting place. This time, as the conference was being held in a hotel, the meeting place was a room in the hotel just outside the main conference room. It’s always good to meet up with friends who you might not have seen since the previous con…

Hi there,

I am a big fan OOP and can't wait to see Modern Object in Perl, Corinna, to be part of core Perl. Last update I had was in early January by Curtis. You can checkout the details here.

If you are new to Corinna then I would recommend you checkout this post by Curtis. Those who don't know, Curtis is leading the team working on Corinna.

Talking about OOP, I came across another post by none other than Curtis himself sharing the common issues with OO code. This should be taught to anyone starting OO in any language and not just Perl, in my humble opinion. Having read it few times already from…

Hi,

Two weeks ago I switched the email sending from an old mailman installation on my own server to Sendgrid. I was hoping to fix the delivery issues, but that did not happen. Some subscribers who have not received the newsletter earlier started to receive it, others stopped receiving it. The big difference is that now I see a report of who has not received it. For example I see many @cpan.org addresses in the bounce list. That's just sad. I got some offers to use other services, free of charge, but frankly I am quite tired of fighting the SPAM filters.

In other news, we really hardly have any i…

Hi there,

I wish all the readers of the weekly newsletter, a very Happy Idd. We are celebrating Idd today in England and luckily it is a Bank Holiday as well.

I have seen Facebook post about the upcoming The Perl and Raku Conference 2022, Houston, TX. With this, I kept wondering why not have London Perl Workshop 2022 too? Being member of the LPW organizing team, I discussed it with fellow member, Julien. Good news is he seems positive about it as well. I don't know whether we have enough time to kickstart the process. Just hoping we get the opportunity to organize the conference. It has been a l…

Hi there

I have just switched from using Mailman to Sendgrid to distribute the Perl Weekly. I hope this will improve the delivery rate. I was wondering what system should I use to maintain the list of registered people and got to the conclusion that, at least for the time being, I'll use a flat file and I'll manually maintain it. We'll see how that works.

In other news, my son started his own start-up company. He and his partner are building a tool for private investors so instead of chasing data sources they can spend more of their time on the decision making process. It would be nice of you if…

Hi there,

Here in England, two long weeks of school holidays are ending for us today. It is Monday bank holiday in England today. From tomorrow, we are back to the school run in the morning and afternoon, whilst fasting during the day as Ramadan is going on.

Let's enjoy the last day of the break and not worry about anything else.

In the last one week or so, I have been sharing Perl sample code in posts on various social media platforms, like The Perl Community, Perl Programmers, Twitter and LinkedIn. It has generated lots of buzz on the subject. Lots of new ideas, at least to me, came to the fore…

Hi!

While the population of the world is growing the language-diversity is shrinking. There are many languages that are used less and less. (Wikipedia has a list by location. I am sure as programmers there are plenty of thing we can also do to help. That's why I have been investing time in LibreLingo project and specifically in Judaeo-Spanish (aka. Ladino, or Judezmo). Now I can also show you the dictionary I have been working on. You can type in words in any of the languages listed there and it will try to find the Ladino word for it. The dictionary is still small. It contains only 3,500 words…

I was getting more and more annoyed with twitter in the last few months (mostly because I had to click "See [some annoying feature] less often" several times a day) and the whole Musk-takeover finally pushed me over the edge. I've set up an account on Mastodon Technology and plan to use this nice, open source, federated tool more and more, and leave twitter behind.

I never really used twitter as a primary platform, but used it to automatically "promote" some of the stuff that's happening on this website. So now I have to port this tools to use Mastodon. Which turned out to be quite easy:

A common critique about slides to my talks is that they are rather annoying to read, because one has to page through the "presentation mode" by clicking next or hitting Enter a lot⁰.

Yesterday I started to change this, and tonight I added some finishing touches like responsive HTML/CSS and an external CSS file. My last three talks are now converted to the new layout, the older ones will follow soon.

You can get to the "single page" view by following the "All in one HTML"-Link. This page should also work ok-ish on small screen sizes (images are shrunk, and preformatted text (i.e. code samples) wi…

Today I spend a few hours hunting a weird bug. I got a report that people entering data for the Steiermärkische Landesbibliothek where not able to find duplicate entries when adding new books. In theory, Koha should search through all the already existing data and present the user with a dialog if they maybe want to reuse the existing entry, if one is found:

This works when an ISBN was entered, but not when "only" title, author and some other data was available. To make things a bit more complicated, we're using the not-default ElasticSearch backend, as opposed to the old-school Zebra⁰ index fo…

A few more days of Advent of Code...

Another path finder, this time with different costs for different paths. This screams for Dijkstra, but for part 1 I still did a more stupid brute force solution using code similar to Day 12 (but using a stack instead of recursion).

For part two my brute force solution was too slow, so I actually had to understand / implement Dijkstra, which took a bit of time, the Wikipedia article and this nice page. It was still rather slow, because I used a plain Perl sort to sort the todo list. Then I thought that I could just group the nodes by cost, thin…

Five more days of coding adventures!

We need to find "low points" in a two-dimensional map of integers ranging from 0 to 9.

For part 1 I used a hash to store the map (with keys like "3_2" for row 3/col 2), and looked in the 4 bordering fields to find lower values (adjusting for corners/borders), I use the classic method (learned in previous years) of looping through a list of offsets to look for the neighbouring values:

for my $move ([-1,0],[1,0],[0,-1],[0,1]) {
     my $look = ($r + $move->[0] ).':'.($c + $move->[1]);
     my $val = $map{ $look };
     ...
 }

If the value…

Durante um ano e meio trabalhei com o mojolicious em um projeto legado dentro de uma empresa de telecomunicações. Aprendi a fazer diversas coisas com ele e hoje vim contar para vocês como ele funciona.

O mojolicious é um framework composto de um conjunto de componentes para desenvolvimento Web em tempo real com Perl usando um MVC bem estruturado. Abaixo podemos observar alguns dos seus recursos disponíveis:

• Implementação cliente/servidor HTTP e WebSocket com IPv6, TLS, SNI, IDNA, proxy HTTP/SOCKS5, socket de domínio UNIX, Comet (long polling), Promises/A+, async/await, keep-alive, timeou…

A new release of the Perl distribution Crypt::OpenSSL::X509 have been uploaded to CPAN.

The release contains contributions from 5 separate people including myself.

• 9 PRs merged
• 4 issues addressed

The PRs had been building up for some time, so I am very happy I was able to find the time to go through them all. There are still 10 open issues and I hope they can get some attention too.

The biggest challenge is OpenSSL 3 support, where we are not exactly there, but I believe we are at a more stable point now, which is a good starting point for this work.

From the trial release was made (2022-04-26) to n…

This post describes the actual Like/Dislike mechanism in the program based on Mojolicious. Web pages style is created using the Bootstrap framework. The full version of the Mojolicious like-dislike demo can be downloaded at: https://github.com/arslonga/like-dislike

So, in the start package Vote.pm we create routers for the post with a certain ID in the section named 'first-section' (for example), and also for like and dislike:

sub startup {
my $self = shift;

my $r = $self->routes;
...
$r->any('/first-section/:id' => [ id => qr/[0-9]+/ ] )->to('post#article');
...
$r->any('/lik…

Como começar a programar em Perl da maneira correta. (Diferente de mim)

Perl Orientado a Objeto Part I

Perl Orientado a Objeto Part II

Perl Orientado a Objeto Part III

Moo - Orientação de objeto minimalista

Diferente do Moose, que vimos anteriormente, o Moo é um sistema de orientação a objetos extremamente leve. Permitindo definições de objetos e funções de maneira bem simples. Tem um sub-conjunto do Moose o Moo evita depender de qualquer módulo XS para permitir implantações simples. Fornece quase dois terços do Moose.

Como dito a cima, o Moo deve ser utilizado quando a…

Perl Orientado a Objeto Part I

Perl Orientado a Objeto Part II

Perl Orientado a Objeto Part III

Moo - Orientação de objeto minimalista

O Moose fornece um conjunto de funções exportadas que torna o Perl Orientado a Objeto com uma sintaxe que funciona de maneira muito mais simples e bonita. Permitindo que voltemos nossa atenção para a abstração de dados, no lugar de focar nos detalhes de implementação.

⚠️ Este post tem como objetivo implementar orientação a objeto com Perl utilizando o Moose, por tanto ele leva em consideração que voc…

when I tried to find a process, I normally use ps with grep command.

sh> ps aux | grep fish
myoungj+     695  0.0  0.0  88596  7000 tty2     S+   09:17   0:00 -/usr/bin/fish -c /usr/bin/gnome-session -l 
myoungj+    2490  0.0  0.1 164660 10140 pts/1    Ss   09:21   0:00 -fish
myoungj+    2665  0.0  0.1 172848 10076 pts/2    Ss+  09:24   0:00 -fish
myoungj+    2781  0.0  0.1 172724  9712 pts/0    Ss+  09:27   0:00 -fish
myoungj+    3024  0.0  0.1 164528  9552 pts/3    Ss+  09:32   0:00 -fish
myoungj+    4709  0.0  0.0   9136  2692 pts/5    S+   10:00   0:00 grep --c…

The examples used here are from the weekly challenge problem statement and demonstrate the working solution.

Write a script to find all prime numbers less than 1000, which are also palindromes in base 10.

use strict;
use warnings;
use Math::Primality qw/is_prime/;

sub palindrome_primes_under{
    my($n) = shift;
    my @palindrome_primes;
    {
        $n--;
        unshift @palindrome_primes, $n if(is_prime($n) && join("", reverse(split(//, $n))) == $n);
        redo if $n > 1;  
    }
    return @palindrome_primes;
}

MAIN:{
    print join(", ", palindrome_primes_under(1000…

The examples used here are from The Weekly Challenge problem statement and demonstrate the working solution.

You are given a list of numbers. Write a script to calculate the sum of the bitwise & operator for all unique pairs.

use strict;
use warnings; 

sub sum_bitwise{
    my $sum = 0;
    for my $i (0 .. @_ - 2){
        my $x = $_[$i];
	map {$sum += ($x & $_)} @_[$i + 1 .. @_ - 1];
    }
    return $sum; 
}

MAIN:{
    print sum_bitwise(1, 2, 3) . "\n";  
    print sum_bitwise(2, 3, 4) . "\n";
}  

$ perl perl/ch-1.pl
3
2

The examples used here are from The Weekly Challenge problem statement and demonstrate the working solution.

Write a script to generate the check digit of a given ISBN-13 code.

use strict;
use warnings;

sub isbn_check_digit{
    my($isbn) = @_;
    my $i = 0;
    my @weights = (1, 3);
    my $check_sum = 0;
    my $check_digit;
    map {$check_sum += $_ * $weights[$i]; $i = $i == 0 ? 1 : 0} split(//, $isbn);
    $check_digit = $check_sum % 10;
    return 10 - $check_digit;
}

MAIN:{
    print isbn_check_digit(978030640615) . "\n";
}

$ perl perl/ch-1.pl
7   

C…

The examples used here are from The Weekly Challenge problem statement and demonstrate the working solution.

Output or return a list of all abecedarian words in the dictionary, sorted in decreasing order of length.

use strict;
use warnings;

sub abecedarian{
    sort {$b->[1] <=> $a->[1]} map {[$_, length($_)]} grep{chomp; $_ eq join("", sort {$a cmp $b} split(//, $_))} @_;
}

MAIN:{
    open(DICTIONARY, "dictionary");
    for my $abc (abecedarian(<DICTIONARY>)){
        print $abc->[0] . " length: " . $abc->[1] . "\n";
    }
    close(DICTIONARY);
}

$ perl perl/c…

The examples used here are from The Weekly Challenge problem statement and demonstrate the working solution.

You are given a positive number, $n < 10. Write a script to generate english text sequence starting with the English cardinal representation of the given number, the word "is" and then the English cardinal representation of the count of characters that made up the first word, followed by a comma. Continue until you reach four.

use strict;
use warnings;

my %cardinals = (
    1 => "one",
    2 => "two",
    3 => "three",
    4 => "four",
    5 => "five",
    6 => "six…

The examples used here are from The Weekly Challenge problem statement and demonstrate the working solution.

You are given a positive number, $n. Write a script to compute the Farey Sequence of the order $n.

use strict;
use warnings;

use POSIX;

sub farey{
    my($order) = @_;
    my @farey;
    my($s, $t, $u, $v, $x, $y) = (0, 1, 1, $order, 0, 0);
    push @farey, "$s/$t", "$u/$v";
    while($y != 1 && $order > 1){
        $x = POSIX::floor(($t + $order) / $v) * $u - $s;
        $y = POSIX::floor(($t + $order) / $v) * $v - $t;
        push @farey, "$x/$y";
        ($s, $t, $u…

You may have noticed that some perl.org services were unavailable this weekend.  Email continued to flow, and no data was lost.

The short version of the story is that we were bitten by this bug. and learned a lot about how Kubernetes works while we figured out what the issue was.

Sorry for any inconvenience!

We sent the below email to all the CPAN Mirror contacts yesterday:

An Important Update about the CPAN Mirror List

You're receiving this email because you're listed as a contact point for a CPAN mirror. Thank you! The mirror network has been a huge part of CPAN’s success. Soon, the way clients use CPAN mirrors is changing. You don't need to do anything, but after reading this email, you might want to.

Some background: For a long time, when the CPAN client (aka CPAN.pm) started up for the first time, it prompted users to configure it by picking a nearby mirror. The assumption was that it would be b…

 The perl.com domain was hijacked this morning, and is currently pointing to a parking site.  Work is ongoing to attempt to recover it.

 We encourage you NOT to visit the domain, as there are some signals that it may be related to sites that have distributed malware in the past.

  Some users may have it selected as their CPAN mirror.  To update your mirror in CPAN.pm use o conf urllist http://www.cpan.org/

# perl -MCPAN -eshell
cpan shell -- CPAN exploration and modules installation (v2.20)
Enter 'h' for help.

cpan[1]> o conf urllist http://www.cpan.org/
Please use 'o conf commit' to make the config perma…

Update 2/21/2021:

Updated information about the future of rt.cpan.org can be found at https://news.perlfoundation.org/post/rt-cpan-org-future

Update 2020-12-13:

rt.cpan.org will be sunset on March 1st, 2021 due to low and declining use.

Back when we started this service, it filled a need by providing a place for CPAN authors to track bug reports and feature requests. In recent years github.com and other sites have added issue tracking to their git repo hosting and many CPAN authors have migrated to these sites.

If you are a CPAN author, there are several tools to help you migrate existing tickets:

• h…

Continuing from the first part, I managed to collect data from Jan to Jul 2021 but unfortunately in the middle of August my VM got rebooted and I forgot to re-run the collecting script so these are all the full months 2021 data that I have.

Draw the conclusion yourself. I end my curiosity here, but might compare again in the future.

1. App::lcpan - Manage your local CPAN mirror
   • Version: 1.070 on 2022-05-09
   • Votes: 14
   • Previous version: 1.069 was 3 days before
2. Carmel - CPAN Artifact Repository Manager
   • Version: v0.1.56 on 2022-05-11
   • Votes: 23
   • Previous version: v0.1.46 was 4 days before
3. Kelp - A web framework light, yet rich in nutrients.
   • Version: 1.06 on 2022-05-09
   • Votes: 44
   • Previous version: 1.05 was 1 year, 3 months, 19 days before
4. LWP - The World-Wide Web library for Perl
   • Version: 6.65 on 2022-05-09
   • Votes: 156
   • P…

This is the weekly favourites list of CPAN distributions. Votes count: 37

Week's winner: Carmel (+5)

Build date: 2022/05/14 13:08:54 GMT

Clicked for first time:

• Devel::DTrace::Provider - Create DTrace providers for Perl programs.
• Net::OpenSRS - Domain registration via the Tucows OpenSRS HTTPS XML API
• OO::DateTime - Lightweight normalised datetime data type
• Quantum::Superpositions::Lazy - Weighted QM-like superpositions with lazy evaluation
• Sys::Utmp - Object(ish) Interface to UTMP files.

Increasing its reputation:

• App::ModuleBuildTiny (+1=11)
• Carmel (+5=23)
• Carton (+2=113)
• CPAN::Meta (+1=24)
• Dancer2::Plugin…

These are the five most rated questions at Stack Overflow last week.
Between brackets: [question score / answers count]
Build date: 2022-05-14 13:07:34 GMT

1. Why does Types::Standard break Scalar::Util::readonly? - [4/1]
2. Perl regex - print only modified line (like sed -n 's///p') - [3/2]
3. multi replace in postgresql query using perl - [2/3]
4. Perl dynamic / symbolic function reference - [2/2]
5. How to open a filehandle with an existing variable in perl? - [2/2]

1. App::lcpan - Manage your local CPAN mirror
   • Version: 1.069 on 2022-05-07
   • Votes: 14
   • Previous version: 1.068 was 11 months, 2 days before
2. Carmel - CPAN Artifact Repository Manager
   • Version: v0.1.45 on 2022-05-07
   • Votes: 18
   • Previous version: v0.1.39 was 2 months, 22 days before
3. Carton - Perl module dependency manager (aka Bundler for Perl)
   • Version: v1.0.35 on 2022-05-07
   • Votes: 110
   • Previous version: v1.0.34 was 3 years, 10 months, 9 days before
4. Cpanel::JSON::XS - cPanel fork of JSON…

This is the weekly favourites list of CPAN distributions. Votes count: 47

Week's winner: Carmel (+3)

Build date: 2022/05/07 14:06:16 GMT

Clicked for first time:

• Business::Stripe::WebCheckout - Simple way to implement payments using Stripe hosted checkout
• Device::Chip - an abstraction of a hardware chip IO driver
• Glib::IO - Perl bindings to the GIO library
• Net::AmazonS3::Simple - simple S3 client support signature v4

Increasing its reputation:

• App::cpanminus (+1=263)
• App::cpm (+1=58)
• App::perlimports (+1=10)
• autocroak (+1=4)
• AWS::Signature4 (+1=4)
• boolean (+1=18)
• Carmel (+3=18)
• Carton (+1=110)
• CBOR::XS (+1=12)
• C…

These are the five most rated questions at Stack Overflow last week.
Between brackets: [question score / answers count]
Build date: 2022-05-07 14:04:39 GMT

1. Wrapping delimited lines, retaining first column, with minimum final length - [4/7]
2. Using sed with back-references calculated - [2/3]
3. what the following syntax means in perl? - [2/2]
4. How to check if a client has disconnected? - [2/1]
5. Perl ImageMagick: how to disable printing of command output? - [2/1]

Foto by Carsten Tolkmit 

We’ve had a week of heated discussion within the Perl 6 community. It is the type of debate where everyone seems to lose. It is not the first time we do this and it certainly won’t be the last. It seems to me that we have one of those about every six months. I decided not to link to many reiterations of the debate in order not to feed the fire.

Before defining sides in the discussion it is important to identify the problems that drives the fears and hopes of the community. I don’t think that the latest round of discussions was about the Perl 6 alias in itself (Raku), but…

When I need to program something, most of the time I use Perl 5, Go or Perl 6. Which one depends on the existence and maturity of libraries and the deployment strategy (and I must admit, probably my mood). Most applications I write at work are not that big, but they need to be stable and secure. Some end up in production as an extension or addition to the software that is the core of our authentication and authorisation infrastructure. Some programs are managed by other teams, e.g. of sysadmin-type applications like the monitoring of a complex chain of microservices. Finally, proof of concept…

There was an interesting discussion on #perl6 (irc.freenode.net) about the use of rakudobrew as a way for end-users to install Rakudo Perl 6 (see how-to-get-rakudo).

rakudobrew, inspired by perlbrew, is a way to manage (and compile) different versions of rakudo. nine argued that it’s primarily meant as a tool for rakudo developers. Because of the increased complexity (e.g. when dealing with modules) it’s not targeted at end-users. While being a big fan of rakudobrew, I agree with nine.

The problem is that there are no Linux binaries on the download page (there are for MacOS and Windows), so user…

EDITED on 20170211: syntastic-perl6 configuration changes

If you’re a Vim user you probably use it for almost everything. Out of the box, Perl 6 support is rather limited. That’s why many people use editors like Atom for Perl 6 code.

What if with a few plugins you could configure vim to be a great Perl 6 editor? I made the following notes while configuring Vim on my main machine running Ubuntu 16.04. The instructions should be trivially easy to port to other distributions or Operating Systems. Skip the applicable steps if you already have a working vim setup (i.e. do not overwrite you .vimrc fil…

I think that Perl 6, as a fairly new language, needs good tooling not only to attract new programmers but also to make the job of Perl 6 programmers more enjoyable. If you’ve worked with an IDE before, you certainly agree that syntax checking is one of those things that we take for granted. Syntastic-perl6 is a plugin that adds Perl 6 syntax checking in Vim using Syntastic. Syntastic is the leading Vim plugin for syntax checking. It supports many programming languages.

If the plugin proves to be useful, I plan on a parallel track for Perl 6 support in Vim. On one hand, this plugin will track th…

When I started programming, back in the day, CGI (the Common Gateway Interface) was still widely used. Usually the Apache webserver would just execute a script or a binary with some environment variables set and serve whatever the executable sent to the standard output, while keeping the standard error in the logs.

This simple and straightforward mechanism can still be used for small programs, but larger applications usually want to save the start-up time and live longer than just a single request.

At that time Perl was used far more often than now, and it had (and still has) the CGI.pm modul…

Over the years I’ve seen and implemented different full-text search applications using various technologies: plain SQL, PostgreSQL, Elasticsearch, Solr, and most recently Xapian.

While Solr and Elasticsearch are very well known, Xapian, despite the fact that it’s available and packaged in all the major GNU/Linux distributions, doesn’t seem to be so popular, at least not among project managers.

But Xapian is fast, advanced, can be configured to do faceted searches (so the user can filter the search results), and my favorite, is fast to build and has virtually no maintenance overhead.

Its main feat…

A casual stroll through the world of Unicode and regular expressions—​Photo by Presidio of Monterey

Character classes in regular expressions are an extremely useful and widespread feature, but there are some relatively recent changes that you might not know of.

The issue stems from how different programming languages, locales, and character encodings treat predefined character classes. Take, for example, the expression \w which was introduced in Perl around the year 1990 (along with \d and \s and their inverted sets \W, \D, and \S).

The \w shorthand is a character class that matches “word charact…

Upgrading Postgres is not quite as painful as it used to be, thanks primarily to the pg_upgrade program, but there are times when it simply cannot be used. We recently had an existing End Point client come to us requesting help upgrading from their current Postgres database (version 9.2) to the latest version (9.6—​but soon to be 10). They also wanted to finally move away from their SQL_ASCII encoding to UTF-8. As this meant that pg_upgrade could not be used, we also took the opportunity to enable checksums as well (this change cannot be done via pg_u…

We do a lot of ecommerce development at End Point. You know the usual flow as a customer: Select products, add to the shopping cart, then check out. Checkout asks questions about the buyer, payment, and delivery, at least. Some online sales are for “soft goods”, downloadable items that don’t require a delivery address. Much of online sales are still for physical goods to be delivered to an address. For that, a postal code or zip code is usually required.

I say usually because there are some countries that do not use postal codes at all. An ecommerce site that expects to ship prod…

The Perl Dancer Conference is a great event, now in its third year. The event took place in the same location as last year in Vienna, Austria at the Hotel Schani Wien. For those of you who have never visited Vienna, it is a perfect place to bring the family. From visiting the beautiful parks to taking a scenic ride on the Danube River, the beautiful and historic city is known for its rich art and musical culture, and has much to offer.

I was very excited to not only attend but also give a talk this year. My talk titled “Dancing in the Clouds” also coincided with the…