prerm is in isdnlog 1:3.25+dfsg1-3.3ubuntu2.
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 17 18 19 20 21 22 23 24 25 | #! /bin/sh
# prerm script for isdnlog
set -e
case "$1" in
    remove)
        if [ -x /etc/init.d/isdnutils-base ]; then
            invoke-rc.d isdnutils-base stop isdnlog
        fi
        ;;
    upgrade|deconfigure)
#       install-info --quiet --remove /usr/info/isdnutils.info.gz
        ;;
    failed-upgrade)
        ;;
    *)
        echo "prerm called with unknown argument \`$1'" >&2
        exit 0
    ;;
esac
exit 0
 |