This file is indexed.

postinst is in inetutils-talk 2:1.9.2-1.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

update-alternatives \
  --install /usr/bin/talk talk /usr/bin/inetutils-talk 100 \
  --slave /usr/share/man/man1/talk.1.gz talk.1.gz \
          /usr/share/man/man1/inetutils-talk.1.gz