Unix/Linux Go Back    


CentOS 7.0 - man page for perlcheat (centos section 1)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


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 195 features may already be overwhelming.

   The sheet
	 CONTEXTS  SIGILS  ref	      ARRAYS	    HASHES
	 void	   $scalar SCALAR     @array	    %hash
	 scalar    @array  ARRAY      @array[0, 2]  @hash{'a', 'b'}
	 list	   %hash   HASH       $array[0]     $hash{'a'}
		   &sub    CODE
		   *glob   GLOB       SCALAR VALUES
			   FORMAT     number, string, ref, glob, undef
	 REFERENCES
	 \	reference	$$foo[1]       aka $foo->[1]
	 $@%&*	dereference	$$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	=	   =	      perldoc.perl.org
	 ->			+	   .	       search.cpan.org
	 ++ --			== !=	   eq ne	      cpan.org
	 **			< > <= >=  lt gt le ge		pm.org
	 ! ~ \ u+ u-		<=>	   cmp		      p3rl.org
	 =~ !~						 perlmonks.org
	 * / % x		SYNTAX
	 + - .			foreach (LIST) { }     for (a;b;c) { }
	 << >>			while	(e) { }        until (e)   { }
	 named uops		if	(e) { } elsif (e) { } else { }
	 < > <= >= lt gt le ge	unless	(e) { } elsif (e) { } else { }
	 == != <=> eq ne cmp ~~ given	(e) { when (e) {} default {} }
	 &
	 | ^		 REGEX METACHARS	  REGEX MODIFIERS
	 &&		 ^	string begin	  /i case insensitive
	 || //		 $	str end (bfr \n)  /m line based ^$
	 .. ... 	 +	one or more	  /s . includes \n
	 ?:		 *	zero or more	  /x ignore wh.space
	 = += -= *= etc  ?	zero or one	  /p preserve
	 , =>		 {3,7}	repeat in range   /a ASCII    /aa safe
	 list ops	 |	alternation	  /l locale   /d  dual
	 not		 []	character class   /u Unicode
	 and		 \b	word boundary	  /e evaluate /ee rpts
	 or xor 	 \z	string end	  /g global
			 ()	capture 	  /o compile pat once
	 DEBUG		 (?:p)	no capture
	  -MO=Deparse	 (?#t)	comment 	  REGEX CHARCLASSES
	  -MO=Terse	 (?=p)	ZW pos ahead	  .   [^\n]
	  -D##		 (?!p)	ZW neg ahead	  \s  whitespace
	  -d:Trace	 (?<=p) ZW pos behind \K  \w  word chars
			 (?<!p) ZW neg behind	  \d  digits
	 CONFIGURATION	 (?>p)	no backtrack	  \pP named property
	 perl -V:ivsize  (?|p|p)branch reset	  \h  horiz.wh.space
			 (?&NM) cap to name	  \R  linebreak
						  \S \W \D \H negate
	 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
	  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		10 hinthash    @INC  include paths
	 11 blksz		3..10 only     @_    subroutine args
	 12 blcks		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.nl>, with the help of many Perl Monks.

SEE ALSO
       o   <http://perlmonks.org/?node_id=216602> - the original PM post

       o   <http://perlmonks.org/?node_id=238031> - Damian Conway's Perl 6 version

       o   <http://juerd.nl/site.plp/perlcheat> - home of the Perl Cheat Sheet

perl v5.16.3				    2013-03-04				     PERLCHEAT(1)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 05:42 AM.