use of comm and sort tools

[Linux for blind general discussion]

This is what I was after. Thanks.

----- Original Message -----
From: Linux for blind general discussion <blinux-list at redhat.com>
To: blinux-list at redhat.com
Date: Thu, 12 May 2022 07:14:38 -0500
Subject: Re: use of comm and sort tools

> Tim here.  If both files have been sorted, you can find just the
> missing ones with
>
>   $ comm -23 mp3.txt m4a.txt
>
> The "-23" means "things that aren't only in file 2, and things that
> aren't in common".
>
> If they're unsorted, I usually reach for awk:
>
>   $ awk 'NR==FNR{b[$0]; next} !($0 in b)' mp3.txt m4a.txt
>
> (note the order reversal of the arguments: first it loads the list of
> all the mp3s and then processes m4a.txt, emitting items that weren't
> in the mp3 list)
>
> Hope this helps,
>
> -Tim
>
> On May 12, 2022, Linux for blind general discussion wrote:
> > I wrote previously about ffmpeg and audio variable bitrate. After
> > conversion, there are some files that did not convert. I would like
> > to compare two listings and discover which ones are missing. So, we
> > have these commands: find . -type f -name \*.m4a | sed -e 's at .*/@@'
> > -e 's/\.4a$//' > m4a.txt find raw2 -type f -name \*.mp3 | sed -e
> > 's at .*/@@' -e 's/\.mp3$//' > mp3.txt Now I want to run comm and have
> > it dump to another file which lines in m4a.txt do not exist in
> > mp3.txt. How would I go about doing that? Or is there a better way?
> >
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