This file is indexed.

preinst is in mpich-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

case "$1" in
   upgrade)

     # If /usr/lib/mpich/man/* are symlinks, delete them so that dpkg will
     # create the directories correctly.  Do this on any upgrade since we 
     # may have done a borken upgrade in the past.
     for x in /usr/lib/mpich/man/* ; do
        if [ -L $x ] ; then
           rm $x
        fi
     done
     ;;

   install)
     ;;
   abort-upgrade)
     ;;

   *)
     echo "preinst called with unknown argument \'$1\'" >&2
     exit 0
     ;;
esac