MirOS Manual: perlcheat(1)


PERLCHEAT(1)    Perl Programmers Reference Guide     PERLCHEAT(1)

NAME

     perlcheat - Perl 5 Cheat Sheet

DESCRIPTION

     This 'cheat sheet' is a handy reference, meant for beginning
     Perl programmers. Not everything is mentioned, but 194
     features may already be overwhelming.

     The sheet

perl v5.8.8                2006-06-30                           1

PERLCHEAT(1)    Perl Programmers Reference Guide     PERLCHEAT(1)

       CONTEXTS  SIGILS             ARRAYS        HASHES
       void      $scalar   whole:   @array        %hash
       scalar    @array    slice:   @array[0, 2]  @hash{'a', 'b'}
       list      %hash     element: $array[0]     $hash{'a'}
                 &sub
                 *glob    SCALAR VALUES
                          number, string, reference, glob, undef
       REFERENCES
       \     references      $$foo[1]       aka $foo->[1]
       $@%&* dereference     $$foo{bar}     aka $foo->{bar}
       []    anon. arrayref  ${$$foo[1]}[2] aka $foo->[1]->[2]
       {}    anon. hashref   ${$$foo[1]}[2] aka $foo->[1][2]
       \()   list of refs
                               NUMBERS vs STRINGS  LINKS
       OPERATOR PRECEDENCE     =          =        perl.plover.com
       ->                      +          .        search.cpan.org
       ++ --                   == !=      eq ne         cpan.org
       **                      < > <= >=  lt gt le ge   pm.org
       ! ~ \ u+ u-             <=>        cmp           tpj.com
       =~ !~                                            perldoc.com
       * / % x                 SYNTAX
       + - .                   for    (LIST) { }, for (a;b;c) { }
       << >>                   while  ( ) { }, until ( ) { }
       named uops              if     ( ) { } elsif ( ) { } else { }
       < > <= >= lt gt le ge   unless ( ) { } elsif ( ) { } else { }
       == != <=> eq ne cmp     for equals foreach (ALWAYS)
       &
       | ^              REGEX METACHARS            REGEX MODIFIERS
       &&               ^     string begin         /i case insens.
       ||               $     str. end (before \n) /m line based ^$
       .. ...           +     one or more          /s . includes \n
       ?:               *     zero or more         /x ign. wh.space
       = += -= *= etc.  ?     zero or one          /g global
       , =>             {3,7} repeat in range
       list ops         ()    capture          REGEX CHARCLASSES
       not              (?:)  no capture       .  == [^\n]
       and              []    character class  \s == [\x20\f\t\r\n]
       or xor           |     alternation      \w == [A-Za-z0-9_]
                        \b    word boundary    \d == [0-9]
                        \z    string end       \S, \W and \D negate
       DO
       use strict;        DON'T            LINKS
       use warnings;      "$foo"           perl.com
       my $var;           $$variable_name  perlmonks.org
       open() or die $!;  `$userinput`     use.perl.org
       use Modules;       /$userinput/     perl.apache.org
                                           parrotcode.org
       FUNCTION RETURN LISTS
       stat      localtime    caller         SPECIAL VARIABLES
        0 dev    0 second     0 package      $_    default variable
        1 ino    1 minute     1 filename     $0    program name
        2 mode   2 hour       2 line         $/    input separator

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PERLCHEAT(1)    Perl Programmers Reference Guide     PERLCHEAT(1)

        3 nlink  3 day        3 subroutine   $\    output separator
        4 uid    4 month-1    4 hasargs      $|    autoflush
        5 gid    5 year-1900  5 wantarray    $!    sys/libcall error
        6 rdev   6 weekday    6 evaltext     $@    eval error
        7 size   7 yearday    7 is_require   $$    process ID
        8 atime  8 is_dst     8 hints        $.    line number
        9 mtime               9 bitmask      @ARGV command line args
       10 ctime  just use                    @INC  include paths
       11 blksz  POSIX::      3..9 only      @_    subroutine args
       12 blcks  strftime!    with EXPR      %ENV  environment

ACKNOWLEDGEMENTS

     The first version of this document appeared on Perl Monks,
     where several people had useful suggestions. Thank you, Perl
     Monks.

     A special thanks to Damian Conway, who didn't only suggest
     important changes, but also took the time to count the
     number of listed features and make a Perl 6 version to show
     that Perl will stay Perl.

AUTHOR

     Juerd Waalboer <juerd@cpan.org>, with the help of many Perl
     Monks.

SEE ALSO

      http://perlmonks.org/?node_id=216602      the original PM post
      http://perlmonks.org/?node_id=238031      Damian Conway's Perl 6 version
      http://juerd.nl/site.plp/perlcheat        home of the Perl Cheat Sheet

perl v5.8.8                2006-06-30                           3

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