preinst is in kde-runtime 4:4.13.0-0ubuntu1.
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | #! /bin/sh
set -e
package_name=kdesudo
# remove old divert
if [ "`dpkg-divert --list|grep $package_name$`" != "" ]; then
rm -f /usr/lib/kde4/libexec/kdesu
dpkg-divert --package $package_name --rename --remove \
/usr/lib/kde4/libexec/kdesu
fi
exit 0
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