eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}' && eval 'exec perl -S $0 $argv:q'
  if 0;
use strict;

# Check filesystem tree (or union of several trees) for unique 
# leaf names; useful for spotting  ambiguities that path-searching
# programs could trip over.

# For each non-unique leaf name found, it prints out "ls" and "md5"
# information for each candidate file.

# Martyn Johnson      maj@cl.cam.ac.uk
# University of Cambridge Computer Lab
# Cambridge UK

my $mdprog = "md5sum"; # Set to command name of "md5" program, or
                 # null string if you don't have it.

my $sep = "\000";
my %map;

foreach my $dir (@ARGV) {
	open (FIND, "find $dir -type f -print |") || die ("open failed: $!");

	while (<FIND>) {
		chop;
		(my $leaf = $_) =~ s-.*/--;
		$map{$leaf} .= "$_$sep";
	}

	close FIND;
}

my $md = "";

foreach my $leaf (sort keys %map) {
	my $files = $map{$leaf};
	chop $files;
	my @paths = split($sep, $files);
	if ($#paths > 0) {
		for (my $i=0; $i<=$#paths; $i++) {
			my $path = $paths[$i];
			my $info = `ls -il "$path"`;
			chop $info;
			$info =~ s/\s+/ /g;
			if ($mdprog) {
			        $md = `$mdprog "$path"`;
				chop $md;
				$md =~ s/^.*= / /;
			}
			$info =~ s/ ([^ ]+$)/$md $1/;
			print ("$info\n");
		}
		print ("\n");                                                
	}
}