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Re: Should [[ -v 1 ]] be supported?


From: Chet Ramey
Subject: Re: Should [[ -v 1 ]] be supported?
Date: Fri, 28 Dec 2018 18:23:57 -0600
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.3.3

On 12/27/18 11:32 PM, Peng Yu wrote:
>> You're whacking moles.  Use a profiler.  That's what they're for.
> 
> I've already shown that $() is a major problem to slow down the speed
> and I have reduced using its usage in my code and significantly
> improved the performance. 

This isn't a major deductive leap, since command substitution forks a
child and reads through a pipe. Forking is always more expensive than
not.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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