Perl

Perl is a programming language invented by Larry Wall to process text. The programming language has been changed many times to do some other things. Some of these things are tasks like making web pages show information in a better way than before, or take information and show it in a way that makes more sense to people. Perl code is written using some symbols besides letters and numbers.

Perl

Paradigm	multi-paradigm: functional, imperative, object-oriented (class-based), reflective, procedural, Event-driven, generic
Designed by	Larry Wall
Developer	Larry Wall
First appeared	1987
Stable release	5.24.0 / May 9, 2016 (2016-05-09)
Preview release	5.23.2 / August 20, 2015 (2015-08-20)
Implementation language	C
OS	Cross-platform
License	GNU General Public License or Artistic License
Filename extensions	.pl .pm .t .pod
Website	www.perl.org
Influenced by
AWK, Smalltalk 80, Lisp, C, C++, sed, Unix shell, Pascal
Influenced
Python, PHP, Ruby, ECMAScript/Javascript, LPC, Windows PowerShell, Falcon, Perl 6, Qore, Julia
Perl Programming at Wikibooks

Usage

Perl is very good at searching through text looking for patterns, which lets people find words that they may be looking for, or also let people find words they are looking for, and change them with different words much more quickly than they would if they had to do it one word at a time.

Perl is also a high-level programming language. A high-level language has advanced features which let the programmer tell the computer what to do without having to worry about how the computer is going to do it as compared to low-level programming languages which often require more programmer effort.

Example

An example Hello World program in Perl:

say 'Hello World!'

You can use variables in Perl.

A variable is a box where you can put items. In Perl, some variables starts with their own sigil. A sigil is the way to tell the Perl interpreter about what type of variable you are using. Variables can be scalar, array, hash, handle, regular expression, typeglob or subroutine.

For example:

my $a_scalar = 2;
my $b = 5.29 ;
my $c = "a string";
my $d = 'another';
my @e = ($b,3,4,$c,$d);
my %f = ('a'=>$b,'cad'=>'pqr',$c=>$d);

Perl packages

The Comprehensive Perl Archive Network, aka CPAN, hosts a large number of extensions to Perl which may be downloaded for free.

Other websites

• Perl.org
• CPAN
• The Perl Foundation