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  1. or download this
    system('some_shell_command') >> 8 and die "Failed!";

...
if ($? >> 8 != 0) {
    die "Failed!";
}
  2. or download this
    system('foobar') == 0 or die "Failed!";

...
if ($? != 0) {
    die "Failed!";
}
  3. or download this
    if ($? == -1) {
    print "failed to execute: $!\n";
...
else {
    printf "child exited with value %d\n", $? >> 8;
}