This file is indexed.

prerm is in mailutils 1:2.2+dfsg1-5.

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" = "remove" ]; then
    for bin in dotlock frm from messages movemail readmsg; do
        update-alternatives --remove $bin /usr/bin/$bin.mailutils
    done
    update-alternatives --remove mailx /usr/bin/mail.mailutils
fi