prerm is in xpat2 1.07-18.
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  | #!/bin/bash -e
case "$1" in
    remove)
        if [ -f /usr/lib/games/xpat/keys.dist ]; then
            rm -f /usr/lib/games/xpat/keys.dist
        fi
        if [ -f /var/games/xpat2/xpat.log ]; then
            rm -f /var/games/xpat2/xpat.log
        fi
    ;;
    upgrade|deconfigure|failed-upgrade)
    ;;
    *)
        echo "prerm called with unknown argument \`$1'" >&2
        exit 0
    ;;
esac
 |