This file is indexed.

prerm is in mpich-shmem-bin 1.2.7-10ubuntu1.

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 != "upgrade" ] ; then 
  update-alternatives --remove mpirun /usr/bin/mpirun.mpich-shmem
fi;