Re: performance bug of [[ $x ]]

From	Chris Down <chris@chrisdown.name>
Newsgroups	gnu.bash.bug
Subject	Re: performance bug of [[ $x ]]
Date	2020-03-07 22:58 +0000
Message-ID	<mailman.2267.1583621904.2412.bug-bash@gnu.org> (permalink)
References	<CABrM6w=ignEwgynRTYYbBLUNs=KVhE8WCf9h=kkgHj00QNoqmw@mail.gmail.com> <20200307225816.GA997327@chrisdown.name>

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Peng Yu writes:
>[[ $x ]] just tests whether the variable $x is of length 0 or not. So
>its performance should not depend on how long the variable is.

Who said it has anything to do with the [[ builtin's performance? A shell does 
a lot more than just running one command.

For this and the last issue you posted, you could quite trivially find out the 
answer yourself using `perf` or another profiler.

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Re: performance bug of [[ $x ]] Chris Down <chris@chrisdown.name> - 2020-03-07 22:58 +0000

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