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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 ; separatorThe 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 under 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) 55f0
Some other Articles
A Train Service Update for Melksham Party in the ParkConfiguring Apache httpd The Story of Well House Manor Finding operating system settings in Perl Perl ... adding to a list - end, middle, start Running operating system commands in Perl Training Course and Business Conference Technology FTP server on Fedora Linux If you are learning Lua, here are some more examples |
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