prerm is in fvwm1 1.24r-56ubuntu2.
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 | #!/bin/sh
set -e
if [ "$1" != "upgrade" ]
then
update-alternatives --remove fvwm /usr/bin/fvwm1
update-alternatives --remove x-window-manager /usr/bin/fvwm1
elif dpkg --compare-versions "$2" lt-nl 1.24r-32
then
# We're downgrading; avoid dpkg prompting about overwriting
# system.fvwmrc
rm -f /etc/X11/fvwm/system.fvwmrc
fi
exit 0
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