This file is indexed.

postinst is in cpio 2.11+dfsg-1ubuntu1.

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

if [ "$1" = configure ]; then
    update-alternatives --install /bin/mt mt /bin/mt-gnu 10 \
      --slave \
	/usr/share/man/man1/mt.1.gz mt.1.gz /usr/share/man/man1/mt-gnu.1.gz
fi