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When an error does occur, it's found inside $! and not $^E
Could $! then be used (instead of $^E) to determine the info you need ? Looking at what you, BrowserUk, and I have posted, it seems that $! might be all you need to consider (so long as it's undeffed before the system call). Or am I missing something ?
Update: I have no problem with Paul's preference for Win32::Process. The variablility in $^E and $!, wrt to system(), doesn't inspire a lot of confidence.
In reply to Re^6: $? set to strange values on failure under Win32