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my $result=`sudo /bin/mount /dev/fd0 /mnt/floppy`;
if ($?) {  # there was an non zero return code
...
} else {
    # looks like it worked
}

if ($? == -1) {
    print "failed to execute: $!\n";
...
    else {
    printf "child exited with value %d\n", $? >> 8;
    }