This file is indexed.

prerm is in gnome-session 3.14.0-2.

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 x-session-manager /usr/bin/gnome-session
fi