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  1. or download this
    >perl -le"system 'foo'; print $?==-1 ? qq{$!=\$!} : qq{\$?=$?}"
'foo' is not recognized as an internal or external command,
operable program or batch file.
$?=256
  2. or download this
    >perl -le"system({ 'foo' } 'foo'); print $?==-1 ? qq{$!=\$!} : qq{\$?=
+$?}"
$?=65280