c1564db05d
Although "--" historically has not been required to be recognized for certain special builtins that do not take options in POSIX, some other implementations recognize options for them, requiring scripts to use "--" or avoid operands starting with "-". Operands starting with "-" can be avoided with eval by prepending a space, and cannot occur with break, continue, exit, return and shift as they only take numbers, nor with times as it does not take operands. With . and exec, avoiding "-" is not so easy as it may require reimplementing the PATH search; therefore the current proposal for POSIX is to require recognition of "--" for them. We continue to accept other strings starting with "-" as operands to . and exec, and also "--" if it is alone to . (which would otherwise be invalid anyway). |
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