Johannes Sixt <j.sixt@xxxxxxxxxxxxx> writes:
> In the snippet above, dashdash will always be set to "--" because a mere
> '+' in the variable expansion only tests whether the variable ('nonrevs')
> is unset, but it is always set. Even ${nonrevs:+"--"} is wrong, and your
> earlier 'test -z' invocation was the correct way to set dashdash.
I do not mind "test -z", so this is just for information, but you could
use variable substitution with a colon, i.e. ${nonrevs:+"--"}.
IIRC, the colon-form ("do this if unset or empty") wasn't understood by
ancient BSDs but these days it is safe to use.
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