suggest: man
perlvar
And you'll find
$CHILD_ERROR
$? The status returned by the last pipe close,
backtick (``) command, or system() operator. Note
that this is the status word returned by the
wait() system call (or else is made up to look
like it). Thus, the exit value of the subprocess
is actually ($? >> 8), and $? & 127 gives which
signal, if any, the process died from, and $? &
128 reports whether there was a core dump.
(Mnemonic: similar to sh and ksh.)
... and so forth..
That should help I'd think.
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