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    <p>The example you supplied using <a href="https://metacpan.org/module/File%3a%3aDirCompare">File::DirCompare</a> works as intended.</p> <p>Keep in mind that the callback subroutine is called for every <em>unique</em> file in each directory and for every pair of files <em>which differ in their content</em>. Having the same filename is not enough, the contents of each file in each directory must be exactly the same as well.</p> <p>Furthermore, the cases in which you report "PASSED" aren't a success at all (by your definition) since they detail the cases in which a file exists in one of the directories, but not the other: meaning the directories' contents are not identical.</p> <p>This should be closer to what you want:</p> <pre class="lang-perl prettyprint-override"><code>#!/usr/bin/perl use strict; use warnings; use File::DirCompare; use File::Basename; sub compare_dirs { my ($dir1, $dir2) = @_; my $equal = 1; File::DirCompare-&gt;compare($dir1, $dir2, sub { my ($a,$b) = @_; $equal = 0; # if the callback was called even once, the dirs are not equal if ( !$b ) { printf "File '%s' only exists in dir '%s'.\n", basename($a), dirname($a); } elsif ( !$a ) { printf "File '%s' only exists in dir '%s'.\n", basename($b), dirname($b); } else { printf "File contents for $a and $b are different.\n"; } }); return $equal; } print "Please specify two directory names\n" and exit if (@ARGV &lt; 2); printf "%s\n", &amp;compare_dirs($ARGV[0], $ARGV[1]) ? 'Test: PASSED' : 'Test: FAILED'; </code></pre>
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