GNU bug report logs - #44704
uniq: replace repeated lines with a message about how many repeated lines

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From: "Brian J. Murrell" <brian <at> interlinx.bc.ca>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 44704 <at> debbugs.gnu.org
Subject: bug#44704: uniq: replace repeated lines with a message about how many repeated lines
Date: Tue, 17 Nov 2020 17:18:07 -0500

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On Tue, 2020-11-17 at 14:10 -0800, Paul Eggert wrote:
> On 11/17/20 5:32 AM, Brian J. Murrell wrote:
>  > [previous line repeated 4 times]
> 
> uniq -c already does something like that, though it outputs "5"
> instead of "4". 

Right.  I had considered that.  Something like:

$ cat /tmp/in | uniq -c | while read c line; do
> echo $line
> if [ $c -gt 1 ]; then
> echo "Last line repeated $((c-1)) times"
> fi
> done

But that eats leading whitespace on $line.

> Not sure it's worth gussying up 'uniq' to provide exactly the
> functionality 
> requested, as output reformatting is easy enough to do yourself using
> awk or 
> Python or whatever.

Right.  But if I were going to pull out such a big hammer, I'd just
again, eliminate uniq and do everything in awk or Python or whatever.

Anyway, it was just a suggestion.  Doesn't seem like it will go much of
anywhere.  That's fine.  If it really itched me enough, I guess I'd
just submit a patch.

Cheers,
b.

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