prerm is in dwm 6.0-6.
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 26 27 28 29 30 31 32 33 34  | #!/bin/sh
set -e
ALTERNATIVES="web maintainer winkey "
case "${1}" in
	remove|deconfigure)
		update-alternatives --quiet --remove dwm /usr/bin/dwm.default
		for ALTERNATIVE in ${ALTERNATIVES}
		do
			update-alternatives --quiet --remove dwm /usr/bin/dwm.${ALTERNATIVE}
		done
		;;
	upgrade|failed-upgrade)
		;;
	*)
		echo "prerm called with unknown argument \`${1}'" >&2
		exit 1
		;;
esac
# Automatically added by dh_installwm
if [ "$1" = "remove" ]; then
	update-alternatives --remove x-window-manager /usr/bin/dwm
fi
# End automatically added section
exit 0
 |