> which I fear may break on old platforms. Otherwise I've assumed that all
> shell variables are in global scope, and that positional parameters are
> stacked and restored at function call boundaries to an arbitrary nesting
> limit.
No, return is pretty safe.
It should be even with an integer return value. If you are at the end of a function (or in an if just before the end of the function, you got it) it is possible to replace it with (exit NUM), but I don't see a good reason to do so.
Paolo
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