Here's the documentation on $? from perlvar

The status returned by the last pipe close, backtick (``) command, successful call to wait() or waitpid(), or from the system() operator. This is just the 16-bit 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 really ("$? >> 8"), and "$? & 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.)

Also see "Error Indicators".

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In reply to Re: how to retrieve the error message returned by the system command by diotalevi
in thread how to retrieve the error message returned by the system command by Muruga

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