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Re: [BUG] false positive: [ ! -o optname ]


From: isabella parakiss
Subject: Re: [BUG] false positive: [ ! -o optname ]
Date: Sun, 25 Sep 2016 23:40:15 +0200

On 9/25/16, Martijn Dekker <address@hidden> wrote:
> The '!' operator in the legacy test/[ builtin does not invert the result
> of the -o operator. Consequently the command
>
>       [ ! -o noclobber ]
>
> amounts to a no-op, always returning exit status 0.
>
> Proof:
>
> $ set -o noclobber && [ -o noclobber ] && [ ! -o noclobber ] && echo bug
> bug
>
> Interestingly, mksh has this bug as well, though not the original pdksh.
>
> Thanks,
>
> - M.
>
>

[ ! -o noclobber ] means
is '!' a non empty string?  if not, is 'noclobber' a non empty string?


---
xoxo iza



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