Questions tagged [perl]

Perl is a procedural, high-level, general-purpose, dynamic programming language, known for its native support of regular expressions and string parsing capabilities. Please use this tag for questions about Perl in general. For things related to the new (but related) language Raku (formerly "Perl 6"), please use the raku tag. For Perl-style regular expressions in other languages, use the regex tag, or, if they are based on the PCRE library, the pcre tag.

Perl is a highly capable, feature-rich programming language with over 25 years of development. Perl runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large-scale development projects.

Perl can also refer to a family of high-level, general-purpose, interpreted, dynamic programming languages. The languages in this family include Perl and Raku (formerly known as Perl 6). For Raku-related questions, please use the tag raku. For "Perl-style" regular expressions in other languages, often based on the PCRE library, do not use tag perl, but tag regex or a more specific tag such as tag pcre.

Related Resources

Official Perl documentation
PerlMonks (aka "The Monastery") - Perl community website with discussion topics, tutorials, reviews, and code snippets.
/r/perl - A subreddit for Perl discussion
jobs.perl.org - Perl jobs
Perl Weekly - Weekly curated news round-up in e-mail and RSS
Perl Mongers - Perl user groups
perl-tutorial.org - collects up-to-date Perl tutorials and warns about outdated ones
Comprehensive Perl Archive Network - The canonical location for Perl code and modules
MetaCPAN - A modern CPAN search site, with an open source backend.
Perl Iron Man - An aggregator of Perl blog posts from all over the world
Learn Perl in about 2 hours 30 minutes
Freenode#perl - Freenode IRC channel for Perl help and discussion
irc.perl.org - Perl IRC network

Perl-related Blogs and Bloggers

blogs.perl.org - Hosted site for Perl-related blogging
$perl->buzz - Perl-related news roundup
Perl Maven - Articles, tutorials, screencasts about Perl
The Effective Perler - A blog by brian d foy
ν42 - Sinan Ünür's blog
Perl Is My Cocaine - Tudor Constantin's blog

Free Perl Programming Books

Perl Programming Books

Related tags

cpan The Comprehensive Perl Archive Network
dbi Database-independent interface for Perl
dbix-class An object-relational mapper (ORM) for accessing DB rows as OO style objects
mod-perl Integrate Perl and the Apache web server
moose A post-modern object system for Perl 5
catalyst An elegant web application framework
mojolicious Perl real-time web framework
dancer A micro web application framework, originally inspired by the Sinatra framework in Ruby.
raku A new language in the Perl family
rakudo Raku implementation that targets MoarVM, the JVM, and the Parrot virtual machine
pugs Raku implemented in Haskell
perl-module Extensions to Perl
tkx, perltk Perl interfaces to Tk.
dist-zilla An increasingly popular Module Authoring and Release tool-kit.
pcre Perl-Compatible Regular Expressions (PCRE)
perlbrew A tool to manage multiple Perl installations in your $HOME directory.
perl-data-structures Data structures in Perl.
pdl Perl Data Language.
strawberry-perl Perl environment for Microsoft Windows.
perl-pod, perldoc Perl documentation
perl-tidy, perl-critic Perl utilities
devel-cover Code coverage metrics for Perl

Date & Time

Libraries for working with dates and times

Devices

Libraries to talk to physical devices

Device::Modem - Talk to modem devices connected via a serial port
Device::Onkyo - Control Onkyo/Integra AV equipment via LAN or serial https://metacpan.org/pod/Device::Modem https://metacpan.org/pod/Device::Onkyo

DevOps Tools

Libraries that help when you want to deploy software across networks on several hosts that are working across computer networks

Rex - Remote Execution

FAQs

Frequently ask questions

Why doesn't my Perl one-liner work on Windows?

More information

Perl Wikipedia Article

67820 questions

votes

1 answer

How to get the type of the reference?

Is there any function available in Perl to check the reference type: my $ref=\@array; I need to get the reference type as array by the function.

perl

asked Aug 04 '10 at 06:03

karthi_ms

5,568
11
38
39

votes

2 answers

Can I force LWP::UserAgent to accept an expired SSL certificate?

I would like to know whether it is possible to force LWP::UserAgent to accept an expired SSL certificate for a single, well-known server. The issue is slightly complicated by the Squid proxy in between. I went as far as to set up a debugging…

perl https lwp

asked Dec 03 '08 at 09:15

fB.

votes

1 answer

Notepad++ regex replace named groups

I try replace author Full name with article title I have a list of articles, similar like this: Albershein P., Nevis D. J. A method for analysis of sugars in plant cell wall polysaccharides by gasliquid chromatography // J. Carbohydrate Research.…

regex perl notepad++ regex-group named

asked Nov 10 '15 at 15:05

Victor Dronov

votes

5 answers

ruby interview question

I got this question in a previous interview and couldnt do it , any idea? What does this do: `$=`;$_=\%!;($_)=/(.)/;$==++$|;($.,$/,$,,$\,$",$;,$^,$#,$~,$*,$:,@%)=( $!=~/(.)(.).(.)(.)(.)(.)..(.)(.)(.)..(.)......(.)/,$"),$=++;$.++;$.++;…

ruby perl

asked Jul 16 '10 at 21:13

fenec

5,637
10
56
82

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6 answers

Is there any Java Library to operate on unix config files like http.conf

There are very good Perl libraries (e.g. Apache::Admin::Config) to operate on traditional unix config files like httpd.conf. Anyone know if there is good Java libraries to do the similar task? I know there is a c library called Augeas with Java…

java linux perl config

asked Jul 14 '10 at 05:55

Gelin Luo

14,035
27
86
139

votes

5 answers

How do you check the success of open (file) in Perl?

The following (not very Perl-ish) code #!/usr/bin/perl if (! -e "mydir/") { print "directory doesn't exist.\n"; } open (my $fh, ">", "mydir/file.txt"); if ($fh) { print "file opened.\n"; print $fh; print $fh "some text\n" or die "failed to…

perl file-io

asked Jul 08 '10 at 13:06

Rhubbarb

4,248
6
36
40

votes

1 answer

What does `sub bar { +{$_[1] => $_[2]} }` exactly do?

I don't understand the + sugar sign in this example taken somewhere while goggling: sub bar { +{$_[1] => $_[2]} } I wrote this and I don't see any differences here: use Data::Dumper; # Not any differences here my $foo = {value => 55}; my $bar =…

perl hash

asked Jul 03 '15 at 07:48

nowox

25,978
39
143
293

votes

1 answer

How many substitutions took place in a Perl s///g?

Small example: perl -e '$s="aaabbcc";$c=()=$s=~/a/g;print"$c\n$s\n"' (m//g) outputs 3 aaabbcc whereas perl -e '$s="aaabbcc";$c=()=$s=~s/a/x/g;print"$c\n$s\n"' (s///g) outputs 1 xxxbbcc I'd like to do both things at once without having to match…

regex perl substitution

asked Jun 23 '10 at 16:00

musiKk

14,751
4
55
82

votes

7 answers

ActivePerl Installation on Windows operating system

I have installed ActivePerl on my Windows OS. I have followed below URL procedure to install ActivePerl Installation After having done that, I have tried to run "perl -v " on the command line. But it reports the following error. The system cannot…

windows perl

asked Jun 16 '10 at 06:06

Pavunkumar

5,147
14
43
69

votes

2 answers

What is the meaning of qr// in perl

I am completely new to perl and trying to design a lexer where I have come across: my @token_def = ( [Whitespace => qr{\s+}, 1], [Comment => qr{#.*\n?$}m, 1], ); and even after going through multiple sites I did not…

regex perl

asked May 07 '15 at 06:16

bansal

votes

3 answers

Fixing a file consisting of both UTF-8 and Windows-1252

I have an application that produces a UTF-8 file, but some of the contents are incorrectly encoded. Some of the characters are encoded as iso-8859-1 aka iso-latin-1 or cp1252 aka Windows-1252. Is there a way of recovering the original text?

perl encoding character-encoding

asked Feb 23 '15 at 19:33

ikegami

367,544
15
269
518

votes

3 answers

What does it mean when you try to print an array or hash using Perl and you get, Array(0xd3888)?

What does it mean when you try to print an array or hash and you see the following; Array(0xd3888) or HASH(0xd3978)? EXAMPLE CODE my @data = ( ['1_TEST','1_T','1_TESTER'], ['2_TEST','2_T','2_TESTER'], ['3_TEST','3_T','3_TESTER'], …

perl arrays hash

asked May 18 '10 at 19:29

Luke

votes

4 answers

How can I run Perl system commands in the background?

#!/usr/bin/env perl use warnings; use strict; use 5.012; use IPC::System::Simple qw(system); system( 'xterm', '-geometry', '80x25-5-5', '-bg', 'green', '&' ); say "Hello"; say "World"; I tried this to run the xterm-command in the background, but…

perl background system

asked Apr 26 '10 at 06:42

sid_com

24,137
26
96
187

votes

7 answers

What is Perl's secret of getting small code do so much?

I've seen many (code-golf) Perl programs out there and even if I can't read them (Don't know Perl) I wonder how you can manage to get such a small bit of code to do what would take 20 lines in some other programming language. What is the secret of…

perl obfuscation

asked Apr 11 '10 at 12:31

sak

votes

3 answers

What exactly are "$a" and "$b" in Perl's "sort()" function?

I understand how to get the results I want from using Perl's sort() function, this is more a question about the inner workings of sort(). Where do the "$a" and "$b" variables come from? I read through the documentation for sort and it seems…

perl sorting scope

asked Sep 30 '14 at 18:26

tjwrona1992

8,614
8
35
98

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