This file is indexed.

prerm is in unison-gtk 2.48.3-1ubuntu1.

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" = "remove" ]; then
    update-alternatives --remove unison /usr/bin/unison-latest-stable-gtk
    if true; then
        update-alternatives --remove unison-gtk /usr/bin/unison-latest-stable-gtk
    fi
fi