system("ls") or die $!;

##</code><code>##

# Works
$return = system("ls");
if ($return != 0) {
    die ($_);
}

#Dies
$return = system("no_such_command");
if ($return != 0) {
    die ($_);
}

##</code><code>##

eval { system("fake_command) };
print "$@";