GNU bug report logs - #24929
comm enhancement proposal: --print-summary --quiet

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From: Pádraig Brady <P <at> draigBrady.com>
To: Bernhard Voelker <mail <at> bernhard-voelker.de>, 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>, 24929 <at> debbugs.gnu.org
Subject: bug#24929: comm enhancement proposal: --print-summary --quiet
Date: Thu, 17 Nov 2016 10:32:16 +0000

On 17/11/16 10:18, Bernhard Voelker wrote:
> On 11/17/2016 11:12 AM, Pádraig Brady wrote:
>> Usually you'd want counts separately from each other
>> and separate from the data itself, in which case wc -l suffices:
>>
>>  $ echo Lines in both = $(comm -12 file1 file2 | wc -l)
>>  $ echo Lines only in 1st = $(comm -23 file1 file2 | wc -l)
>>  $ echo Lines only in 2nd = $(comm -13 file1 file2 | wc -l)
>>
>> So this is in the efficiency/convenience category.
> 
> You mean to change the --total flag to accept an argument?
> 
>   $ echo Lines in both = $(    comm -123 --total=3 file1 file2)
>   $ echo Lines only in 1st = $(comm -123 --total=1 file1 file2)
>   $ echo Lines only in 2nd = $(comm -123 --total=2 file1 file2)
> 
> and
> 
>   $ echo Lines only in 1st or 2nd = $(comm -123 --total=1,2 file1 file2)

Sorry I meant if you only wanted a single count,
then the existing tools suffice.

Your implementation is fine as is I think.

thanks,
Pádraig

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