exit codes (was: Identifier length?)

[Henry Spencer]

In article <12143 at haddock.ima.isc.com> suitti at haddock.ima.isc.com (Stephen Uitti) writes:
>->...most existing C programs exit with a code of 0, 1, or 2 and that
>->0=success, nonzero=failure is a common convention):
>
>What does "2" commonly mean?  "Other kind of error?" ...

The usual custom is that 0 means success, 1 means failure, 2 means it was
invoked improperly (e.g. unknown option) and hence didn't even try.
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