prerm is in slbackup 0.0.12-8.
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  | #!/bin/sh
set -e
# slbackup prerm script
# Modified by Morten Werner Olsen <werner@skolelinux.no>
if [ "$1" = "upgrade" -o "$1" = "remove" ]; then
    if [ -L /usr/doc/slbackup ]; then
	rm -f /usr/doc/slbackup
    fi
fi
exit 0
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