Current Perl documentation can be found at perldoc.perl.org.
Here is our local, out-dated (pre-5.6) version:
Here's a little program that generates all permutations of all the words on each line of input. The algorithm embodied in the
permute()
function should work on any list:
#!/usr/bin/perl -n # tsc-permute: permute each word of input permute([split], []); sub permute { my @items = @{ $_[0] }; my @perms = @{ $_[1] }; unless (@items) { print "@perms\n"; } else { my(@newitems,@newperms,$i); foreach $i (0 .. $#items) { @newitems = @items; @newperms = @perms; unshift(@newperms, splice(@newitems, $i, 1)); permute([@newitems], [@newperms]); } } }