Your sort operator needs to impose a lexicographic ordering on the lists defined by your "paths", as in this example: 
#!/usr/bin/perl
use strict;
use warnings;

# parse the paths into lists
my @data;
while ( <DATA> ) {
    chomp;
    push @data, [ split m:/:, $_ ];
}

sub compare_lists_lexicographically {
    # make copies of the input lists
    my @left = @$a;
    my @right = @$b;

    # chew threw the lists until
    #   a) we discover they're different lengths, or
    #   b) the elements are different, or
    #   c) neither
    while ( 1 ) {
        if ( !@left && !@right ) {
            # ran out at the same time: they're equal
            return 0;
        }
        elsif ( !@left ) {
            # left is shorter than right: left is first
            return -1;
        }
        elsif ( !@right ) {
            # right is shorter than left: right is first
            return 1;
        }
        else {
            # check the next element from each list
            my ( $l, $r ) = ( shift @left, shift @right );

            # NB: use < if fields are numeric, lt otherwise
            if ( $l < $r ) {
                # next element of left comes first
                return -1;
            }
            elsif ( $r < $l ) {
                # next element of right comes first
                return 1;
            }
            # else equal, keep checking
        }
    }
}

# display the output
printf "%s\n", join '/', @$_ for sort compare_lists_lexicographically 
+@data;

__DATA__
0/1/2/3
0
0/4/5/6
0/4
0/1
0/1/2
0/4/5
0/10/111/145
0/10/111
0/10

[download]
HTH,
--athomason

In reply to Re: Sorting path like strings by athomason
in thread Sorting path like strings by BUU

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