prerm is in slack 0.15.2-6.
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  | #!/bin/sh
set -e
if [ "$1" = "purge" -o "$1" = "remove" ]; then
	unset CACHE
	unset STAGE
        . /etc/slack.conf
        # purge the cache
	if [ -n "$CACHE" ]; then
        	rm -rf "$CACHE"/*
	fi
        # remove the stage
	if [ -n "$STAGE" ]; then
        	rm -rf "$STAGE"
	fi
fi
exit 0
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