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perl-tutorial.org - collects up-to-date Perl tutorials and warns about outdated ones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

Why don't I get any syntax errors when I execute my Python script with Perl?

I just wrote some testing python code into test.py, and I'm launching it as follows: perl test.py After a while I realized my mistake. I say "after a while", because the Python code gets actually correctly executed, as if in Python interpreter! Why…

python perl

asked Apr 10 '15 at 14:19

Dacav

13,590
11
60
87

votes

6 answers

Multiline search replace with Perl

I know this kind of questions have been asked already many times before. The reason why I come here again is that I feel like I've missed something simple and fundamental. Is it possible to make this kind of search-replace routine better. For…

perl

asked Jun 23 '09 at 05:43

user44556

5,763
5
30
27

votes

6 answers

How do I sleep for a millisecond in Perl?

How do I sleep for shorter than a second in Perl?

perl sleep

asked May 22 '09 at 08:38

ˈoʊ sɪks

votes

5 answers

How can I use CPAN as a non-root user?

I want to install perl modules on a shared server on which I do not have root access. How can I do this? They also seem to have an older version of CPAN (it complains about that when running the command), is it possible to update the CPAN command…

perl cpan

asked Jun 05 '10 at 12:20

Juan A. Navarro

10,595
6
48
52

votes

9 answers

Is there a Perl shortcut to count the number of matches in a string?

Suppose I have: my $string = "one.two.three.four"; How should I play with context to get the number of times the pattern found a match (3)? Can this be done using a one-liner? I tried this: my ($number) = scalar($string=~/\./gi); I thought that…

arrays regex perl perl4

asked Dec 04 '09 at 20:04

Geo

93,257
117
344
520

votes

12 answers

"inappropriate ioctl for device"

I have a Perl script running in an AIX box. The script tries to open a file from a certain directory and it fails to read the file because file has no read permission, but I get a different error saying inappropriate ioctl for device. Shouldn't it…

perl ioctl

asked Oct 22 '09 at 05:30

someguy

1,193
1
12
17

votes

14 answers

In Perl, how do I create a hash whose keys come from a given array?

Let's say I have an array, and I know I'm going to be doing a lot of "Does the array contain X?" checks. The efficient way to do this is to turn that array into a hash, where the keys are the array's elements, and then you can just say if($hash{X})…

arrays perl hash

asked Sep 18 '08 at 19:08

raldi

21,344
33
76
86

votes

8 answers

How can I call a shell command in my Perl script?

What would be an example of how I can call a shell command, say 'ls -a' in a Perl script and the way to retrieve the output of the command as well?

perl

asked Jul 08 '10 at 05:07

Yang

9,794
15
44
52

votes

1 answer

The recognizing power of "modern" regexes

What class of languages do real modern regexes actually recognise? Whenever there is an unbounded length capturing group with a back-reference (e.g. (.*)_\1) a regex is now matching a non-regular language. But this, on its own, isn't enough to match…

regex perl theory context-free-grammar language-theory

asked Jan 30 '11 at 03:33

tobyodavies

27,347
5
42
57

votes

4 answers

How do I enable automatic folds in Vim?

How do I enable automatic folding in Vim? set foldmethod=syntax doesn't seem to do much of anything.

javascript perl vim folding

asked Jan 25 '11 at 03:05

Eric Johnson

17,502
10
52
59

votes

2 answers

What does the <<'m'=~m>> syntax mean in perl?

So I understand that perl has much unusual syntax, but I came across a code snippet at work that other day that has left me confused. Could someone please explain to me what it means: <<'m'=~m>> print $a unless $b; return; m ; It looks like HEREDOC…

perl

asked Sep 19 '15 at 07:35

AliceHemp

votes

10 answers

Perl: if ( element in list )

I'm looking for presence of an element in a list. In Python there is an in keyword and I would do something like: if element in list: doTask Is there something equivalent in Perl without having to manually iterate through the entire list?

perl arrays

asked Mar 04 '10 at 23:32

Jonathan

3,464
9
46
54

votes

4 answers

String compare in Perl with "eq" vs "=="

I am (a complete Perl newbie) doing string compare in an if statement: If I do following: if ($str1 == "taste" && $str2 == "waste") { } I see the correct result (i.e. if the condition matches, it evaluates the "then" block). But I see these…

string perl

asked Dec 26 '12 at 21:48

hari

9,439
27
76
110

votes

9 answers

Command line: search and replace in all filenames matched by grep

I'm trying to search and replace a string in all files matched by grep: grep -n 'foo' * will give me output in the form: [filename]:[line number]:[text] For each file returned by grep, I'd like to modify the file by replacing foo with bar.

linux perl awk sed grep

asked Jan 22 '09 at 22:54

Michael Kristofik

34,290
15
75
125

votes

8 answers

Programmatically read from STDIN or input file in Perl

What is the slickest way to programatically read from stdin or an input file (if provided) in Perl?

perl stdin

asked Jun 29 '10 at 07:23

syker

10,912
16
56
68

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