This file is indexed.

prerm is in emacs25-bin-common 25.1+1-4+deb9u1.

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

FLAVOR=emacs25
MAJOR=25
MINOR=1
FULL=25.1
ALTERNATIVES="ctags ebrowse emacsclient etags"

# update-alternatives on things that collide with xemacs, other editors
if [ "$1" != "upgrade" ]
then
  for i in ${ALTERNATIVES}
  do
    update-alternatives --remove $i /usr/bin/$i.${FLAVOR}
  done
fi