One brute-force method is:

• Store all your paths into an array.
• Two nested loops through the array
• Create a hash of parent directories, using index.
• Loop through your hash and print just the leaf directories.

use strict;
use warnings;

my @dirs;
while (<DATA>) {
    chomp;
    push @dirs, $_;
}

my %parents;
for my $dir1 (@dirs) {
    for my $dir (@dirs) {
        if (index($dir1, $dir) == 0) {
            # $dir1 is a substring of $dir, starting at pos 0
            $parents{$dir}++;
        }
    }
}

for (keys %parents) { print "$_\n" if $parents{$_} == 1 }

__DATA__
/tmp/a
/tmp/a/b
/tmp/a/b/c
/tmp/a/b/c/e
/tmp/a/b/d
/tmp/a/b/d/g
/tmp/a/b/d/g/h
/tmp/a/b/d/g/i
/tmp/a/b/k
[download]

Prints:

/tmp/a/b/d/g/h
/tmp/a/b/d/g/i
/tmp/a/b/k
/tmp/a/b/c/e
[download]

I used this technique to solve a similar problem. Hopefully, our fellow monks will provide a more elegant solution.

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