Perl


 * mod_perl
 * MinGW
 * Geo-Proj4
 * Regex Tester

Dup
Here's an example of how to dup a file descriptor when you have a reference to it. It's equivalent to C's dup2 call.

my $ref = \*STDOUT; open my $fh, ">&", $ref or die $!;

This is posted here because it doesn't seem to be mentioned in most Perl documentation about open.