Sometimes programs to use system error codes as exit codes. For example, Perl uses $! as as the error code when you call die. A quick and dirty way of finding the meaning of an system error number is to assign it to $^E. 

$ perl -E'$^E=13; say $^E;'
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In reply to Re: question on exitcode provided by status() method of Win32::Job by ikegami
in thread question on exitcode provided by status() method of Win32::Job by stevehs17

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