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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 06:42:35) Associated topics are indexed under P210 - Perl - Topicalization and Special Variables
Some other Articles
A Train Service Update for Melksham Party in the ParkConfiguring Apache httpd The Story of Well House Manor Environment variables in Perl / use Env 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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Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 at 50 posts per pageThis is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.
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