POSTIN

/bin/sh

/usr/sbin/update-alternatives \
    --install /usr/bin/whois \
        whois /usr/bin/whois.md 30 \
    --slave /usr/share/man/man1/whois.1.gz \
        whois-man /usr/share/man/man1/whois.md.1.gz

POSTUN

/bin/sh

if [ $1 -eq 0 ] ; then
    /usr/sbin/update-alternatives --remove \
        whois /usr/bin/whois.md
fi