I recently wrote a script that modifies files and copies them to a different directory. The user can specify on the command line the source and target directories, but I needed to ensure that those directories are different. For example, when running my script, -s specifies the source and -d specifies the destination, but the following command uses the same directory, despite being superficially different: 
prod.pl -an -s . -d ../cgi-bin

[download]
It seems like a bit of an ugly hack, so if anyone knows of a module with similar functionality, please speak up!

This was written for a WinNT box. Any suggestions for ensuring portability?

Update: This is what I love about this place: see AltBlue's answer below. Short, sweet, and to the point. More importantly, it shows that I should have read the Cwd docs more closely :)

#C:\perl\bin\perl.exe
use warnings;
use strict;
use Cwd;

my $source = '.';
my $target = '../cgi-bin';

print sameDirectory( $source, $target ) ? 'Same' : 'Different';

sub sameDirectory {
    my ( $dir1, $dir2 ) = @_;

    my $currentDir = getcwd();

    chdir $dir1 or die "Can't CD to $dir1: $!";
    my $realDir1 = getcwd();

    # Need to change back in case they were using relative directories
    chdir $currentDir or die "Can't CD to $currentDir: $!";
    chdir $dir2 or die "Can't CD to $dir2: $!";
    my $realDir2 = getcwd();

    # Return them to their home directory
    chdir $currentDir or die "Can't CD to $currentDir: $!";;
    return $realDir1 eq $realDir2 ? 1 : 0;
}

[download]

In reply to Test to see if directories are the same by Ovid

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