use Data::Dumper;
print Dumper \%hash_mnt;
__END__
$VAR1 = {
        '/proc/bus/usb' => [ ['usbfs'],     [undef] ],
        '/sys'          => [ ['none'],      [undef] ],
        '/'             => [ ['/dev/hda1'], [undef] ],
        '/dev/pts'      => [ ['none'],      [undef] ],
        '/tmp'          => [ ['/dev/hda5'], [undef] ],
        '/proc'         => [ ['proc'],      [undef] ],
        '/home'         => [ ['/dev/hda6'], [undef] ]
};