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[2004-01-13] Numeric Unix Error Messages
It's an unfortunate fact that many programmers are lazy about error messages. Very often, all you get is a cryptic "Error 5", and you may be lucky to get that: sometimes all you get is an error return that you have to examine yourself with "echo $?". You can't even depend on that being the actual Unix error, but even if it is, what does it mean?
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