This file is indexed.

preinst is in qt4-designer 4:4.8.7+dfsg-5ubuntu2.

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.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
#!/bin/sh

set -e

case "$1" in
    upgrade)
        if dpkg --compare-versions $2 "<<" 4:4.8.5
        then
            update-alternatives --remove designer "/usr/bin/designer-qt4"
        fi ;;
esac