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Finding operating system settings in Perl

In Perl, you have a variety of special variables available to you ... preloaded with information in many cases. Some of their names are "special" such as $^O, $^T, $", $/, $! or $_, and others are capitalised such as @ARGV, @ISA, %INC and %ENV.

Here's a snippet of code that checks whether you're running on a Microsoft based operating system through the $^O variable, then splits the PATH environment variable which it gets from the %ENV hash into a series of directories that the operating system searches for executable programs.

$sep = ($^O =~ /^MS/) ? ";" : ":"; # Windows uses ; separator
@pels = split(/$sep/,$ENV{PATH});



The complete code example, which lists out all executable files available to you in alphabetic order, is listed here.
(written 2008-07-10)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P210 - Perl - Topicalization and Special Variables
  [3449] Apache Internal Dummy Connection - what is it and what should I do with it? - (2011-09-19)
  [2972] Some more advanced Perl examples from a recent course - (2010-09-27)
  [2876] Different perl examples - some corners I rarely explore - (2010-07-18)
  [2833] Fresh Perl Teaching Examples - part 2 of 3 - (2010-06-27)
  [1922] Flurinci knows Raby Lae PHP and Jeve - (2008-12-04)
  [1860] Seven new intermediate Perl examples - (2008-10-30)
  [1829] Dont bother to write a Perl program - (2008-10-10)
  [1728] A short Perl example - (2008-07-30)
  [1705] Environment variables in Perl / use Env - (2008-07-11)
  [1508] How not to write Perl? - (2008-01-15)
  [1444] Using English can slow you right down! - (2007-11-25)
  [1289] Pure Perl - (2007-08-03)
  [1232] Bathtub example - (2007-06-14)
  [1221] Bathtubs and pecking birds - (2007-06-07)
  [1136] Buffering output - why it is done and issues raised in Tcl, Perl, Python and PHP - (2007-04-06)
  [969] Perl - $_ and @_ - (2006-12-07)
  [639] Progress bars and other dynamic reports - (2006-03-09)
  [493] Running a Perl script within a PHP page - (2005-11-12)


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