On Tue, 20 Dec 2022 at 22:02, David <bouncingc...@gmail.com> wrote:

> $ echo -e '100:CD001\n200:CD001' | awk 'BEGIN { FS=":" } /CD001/ &&
> NR==1 { print $1 - 50 }'
> 50

Oops, my mistake, that's not the solution. Give me another minute and I
will post a better one one.

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