This file is indexed.

prerm is in dia-gnome 0.97.2-15ubuntu1.

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

if [ "$1" != "upgrade" ]; then
  update-alternatives --remove dia /usr/bin/dia-gnome
  update-alternatives --remove dia /usr/bin/dia-gnome-integrated
fi