PREUN
/bin/sh
[ "$1" != 0 ] || /usr/sbin/update-alternatives --remove nbook.bin \ /usr/share/games/sjeng/nbook-medium.bin
POSTIN
/bin/sh
/usr/sbin/update-alternatives --install /usr/share/games/sjeng/nbook.bin \ nbook.bin /usr/share/games/sjeng/nbook-medium.bin 20