Re: possible in bash?: filter stderr of a prog & send filtered-output out on stderr leaving stdout untouched

[Dennis Williamson]

On Tue, Dec 6, 2016 at 4:09 PM, L A Walsh <bash@tlinx.org> wrote:

Is there a way, in bash, to filter stderr and let the
filtered result continue on stderr with the original
stdout being output on stdout?

with prog being the program to filter, and RE_filt being the
filtering _expression_, conceptually, I wanted to do something
like this:

$prog >&3 2>&1 |grep -v "$RE_filt" >&2 3>&1

(which of course doesn't work)....

Is it possible/doable?

Tnx!
-l

http://mywiki.wooledge.org/BashFAQ/047 (search for "stdout intact")

 

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