This file is indexed.

postinst is in heimdal-clients 1.6~git20131207+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 -e

for i in ftp telnet rsh rcp pagsh
do
    update-alternatives --install /usr/bin/$i $i /usr/bin/k$i 23 \
    --slave /usr/share/man/man1/$i.1.gz $i.1.gz /usr/share/man/man1/k$i.1.gz
done