preinst is in proftpd-mod-geoip 1.3.5e-1build1.
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 | #!/bin/sh
set -e
if [ "$1" = "install" ] || [ "$1" = "upgrade" ]
then
if dpkg --compare-versions "$2" lt-nl "0.3-1+deb7u1"
then
rm -fv $(dpkg-query --control-path proftpd-mod-geoip postrm)
fi
fi
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