code.pl

#!/usr/bin/perl
#this script search for frag on a fs
use strict;
use warnings;
    
#number of files
my $files = 0;
#number of fragment
my $fragments = 0;
#number of fragmented files
my $fragfiles = 0;

#search fs for all file
open (FILES, '-|', 'find', $ARGV[0],'-xdev', '-type', 'f', '-print0');
    
$/ = "\0";
    
while (defined (my $file = <FILES>)) {
    open (FRAG, '-|', 'filefrag', $file);
    my $res = <FRAG>;
    if ($res =~ m/.*:\s+(\d+) extents? found/) {
        my $fragment = $1;
        $fragments += $fragment;
        if ($fragment > 1) {
            $fragfiles++;
        }
        $files++;
    } else {
        print ("$res : not understand for $file.\n");
    }
    close (FRAG);
}
close (FILES);
    
print ( $fragfiles / $files * 100 . "% non contiguous files, " . $fragments / $files . " average fragments.\n");