This file is indexed.

preinst is in python-matplotlib 1.1.1~rc1+git20120423-0ubuntu1.

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
# TODO: remove this file after releasing Squeeze
set -e
if [ "$1" = upgrade ]
then
       if dpkg --compare-versions "$2" lt 0.98.5.3-1 ; then
               pycentral pkgremove python-matplotlib
       fi
fi