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  1. or download this
    use warnings; use strict; my $s;
$s = system q(cat),  qw(nosuchfile);       printf q(ret=0x%04x, err=>>
+%s<<%s), $s, $!, $/; $!=0;
$s = system q(xcat), qw(nosuchfile);       printf q(ret=0x%04x, err=>>
+%s<<%s), $s, $!, $/; $!=0;
$s = system q(perl), q(-le), q(exit 0x13); printf q(ret=0x%04x, err=>>
+%s<<%s), $s, $!, $/; $!=0;
$s = system q(perl), q(-le), q(exit 0xFF); printf q(ret=0x%04x, err=>>
+%s<<%s), $s, $!, $/; $!=0;
  2. or download this
    cat: nosuchfile: No such file or directory
ret=0x0100, err=>><<
...
ret=0xffffffff, err=>>No such file or directory<<
ret=0x1300, err=>><<
ret=0xff00, err=>><<