Effect on speed of comments in bash script loops?

Scott Elcomb psema4-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org
Thu Nov 15 20:37:13 UTC 2012


On Thu, Nov 15, 2012 at 3:27 PM, Walter Dnes <waltdnes-SLHPyeZ9y/tg9hUCZPvPmw at public.gmane.org> wrote:
>   Assume a bash script crunching through a large text file, with an
> inner loop that gets called a lot.  I like to heavily comment complex
> scripts, so 6 months later I don't have to spend days trying to figure
> out what they do.  Are the comments parsed+discarded on each pass
> through the loop?  If necessary, I could keep a commented "master"
> script and an uncommented "working" script, like so...
>
> echo '#!/bin/bash' > working
> grep -v "^#" master >> working
> chmod 744 working
>
>   The working script would execute the same as the commented master
> script, but possibly faster.

i pretty sure there'll be better answers from more knowledgeable folks
but I'm curious... is there a noticeable difference in execution
times?

time /path/to/master
time /path/to/working

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