prerm is in xfwm4 4.10.1-3.
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 | #!/bin/sh
set -e
# remove alternatives links
if [ "$1" = "remove" ]; then
update-alternatives --remove x-window-manager /usr/bin/xfwm4
fi
exit 0
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