/perl-cheatsheet

Perl Cheatsheet

Introduction

  • interpreted language, interpreter reads and executes code instead of target machine
  • dynamic scripting language, type and values are both dynamic, type checking done at runtime
  • powerful text processing
  • used to write Common Gateway Interface (CGI) scripts that allow web servers to communicate with external programs
  • powerful string parsing

Setup

  • download Perl interpreter
  • '.pl' file extension
  • start with #! Shebang line pointing to interpreter's binary

Syntax

$variable = "string123";

my $localVariable = "local variable";
our $globalVariable = "global variable";

@array = (1, 2, 3);
@array[1];

%dictionary = ('hash', 1, 'key', 'value');
%dictionary{'key'};

if (5 > 10) {
    print "hi";
}
unless (5 < 10) {
    print "hi";
}

sub SomeFunction {
    my ($arg1, $arg2) = @_;
    print $arg1 + $arg2;
}
SomeFunction(1, 2);

if ($text =~ /cool/) {
    ## regex is built in
}

Render code: perl app.pl