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notes:perl_cheat_sheet

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notes:perl_cheat_sheet [2026/06/12 06:29]
176.78.89.95 old revision restored (2013/09/15 03:01) 		notes:perl_cheat_sheet [2026/06/13 20:45] (current)
37.122.190.32 old revision restored (2026/05/23 12:38)
Line 13: Line 13:
   * Comments start with # (no block comments)   * Comments start with # (no block comments)
   * Parenthesis are optional unless part of syntax.   * Parenthesis are optional unless part of syntax.
-  * ''@ARGV'' contains arguments, $0 contains program name. 
-  * ''die'' can be used to exit early $! will contain any system error message. Without \n at the end, perl will append line number to error message. 
  
 ===== Numbers ===== ===== Numbers =====
Line 93: Line 91:
     print "It was $_ that I saw!\n";     print "It was $_ that I saw!\n";
 }</code> }</code>
-  * ''print'' takes list of items and sends all to STDOUT (unseparated). ''print @array;'' vs ''print "@array";'' <code perl>print <>;          # source code for 'cat' 
-print sort <>;     # source code for 'sort'</code> 
-  * C-like printf function %g for number auto-format,%10s, %-10d etc.<code perl>my @items = qw( wilma dino pebbles ); 
-my $format = "The items are:\n" . ("%10s\n" x @items); 
-printf $format, @items; 
-printf "The items are:\n".("%10s\n" x @items), @items; 
-</code> 
-  * Filehandles can be barewords (upper-cased) or variables. Special filehandles are : STDIN, STDOUT, STDERR, DATA, ARGV, and ARGVOUT .<code perl>open CONFIG, '<dino';  # < is optional 
-open BEDROCK, '>fred' || die "Cannot open fred: $!"; 
-open LOG, '>>:encoding(UTF-8)','logfile'; # for perl >= 5.6 
-open BEDROCK, '>:crlf', $file_name; # DOS-formatted output 
-binmode STDOUT, ':encoding(UTF-8)';</code> 
 ===== User Subroutines ===== ===== User Subroutines =====
  
notes/perl_cheat_sheet.1781270973.txt.gz · Last modified: 2026/06/12 06:29 by 176.78.89.95

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