0: Perl 5 cheat sheet v6 by Juerd Waalboer, http://juerd.nl/
1: .
2:  CONTEXTS  SIGILS   ARRAYS        HASHES
3:  void      $scalar  @array        %hash
4:  scalar    @array   @array[0, 2]  @hash{'a', 'b'}
5:  list      %hash    $array[0]     $hash{'a'}
6:            &sub
7:            *glob    SCALAR VALUES
8:                     number, string, reference, glob, undef
9:  REFERENCES
10:  \     references      $$foo[1]       aka $foo->[1]
11:  $@%&* dereference     $$foo{bar}     aka $foo->{bar}
12:  []    anon. arrayref  ${$$foo[1]}[2] aka $foo->[1]->[2]
13:  {}    anon. hashref   ${$$foo[1]}[2] aka $foo->[1][2]
14:  \()   list of refs
15:                          NUMBERS vs STRINGS  LINKS
16:  OPERATOR PRECEDENCE     =          =        perl.plover.com
17:  ->                      +          .        search.cpan.org
18:  ++ --                   == !=      eq ne         cpan.org
19:  **                      < > <= >=  lt gt le ge   pm.org
20:  ! ~ \ u+ u-             <=>        cmp           tpj.com
21:  =~ !~                                            perldoc.com
22:  * / % x                 SYNTAX
23:  + - .                   for    (LIST) { }, for (a;b;c) { }
24:  << >>                   while  ( ) { }, until ( ) { }
25:  named uops              if     ( ) { } elsif ( ) { } else { }
26:  < > <= >= lt gt le ge   unless ( ) { } elsif ( ) { } else { }
27:  == != <=> eq ne cmp     for equals foreach (ALWAYS)
28:  &
29:  | ^              REGEX METACHARS          REGEX MODIFIERS
30:  &&               ^ string begin           /i case insensitive
31:  ||               $ string end (before \n) /m line based ^$
32:  .. ...           + one or more            /s dot includes \n
33:  ?:               * any amount             /x ignore wh.space
34:  = += -= *= etc.  ? zero or one            /g global
35:  , =>             () capture
36:  list ops         (?:) no capture     REGEX CHARCLASSES
37:  not              [] character class  .  == [^\n]
38:  and              | alternation       \s == [\x20\f\t\r\n]
39:  or xor           {1,2} amount        \w == [A-Za-z0-9_]
40:                   \b word boundary    \d == [0-9]
41:                   \z string end       \S, \W and \D negate
42:  ALWAYS
43:  use strict;        NEVER unless pro      LINKS
44:  use warnings;      "$foo"                perl.com
45:  my $var;           $foo = "bar"; $$foo   perlmonks.org
46:  open() or die $!;  `$userinput`          use.perl.org
47:  use Modules;       /$userinput/          perl.apache.org
48: 
49: 
50: This is my christmas gift for all Perl newbies out there :)
51: Have fun!
52: 
53: v1: initial version
54: v2: fixed per merlyn's suggestions
55: v3: added missing dollar signs
56: v4: changed per TheDamian's suggestions
57: v5: changed per TheDamian's suggestions
58: 
59: 
60: Note: It's hard to maintain two copies, so if you want
61: the most recent version, visit my homepage. Sorry!
62: 
63: Update: If you have Perl 5.8.1 or later installed, try this
64: on a command line:
65: 
66: perldoc perlcheat  # :)