Re: performance bug of [[ $x ]]

[Chris Down]

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.