postrm is in yorick-data 2.2.01+dfsg-2.
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/sh
set -e
case $1 in
    remove)
	if [ -e /usr/share/yorick ]; then
	    rm -Rf /usr/share/yorick
	fi
	;;
    purge)
	# remove dangling conffiles from previous version
	# if Yorick is purged but they are still around
	if [ -e /etc/yorick ] && \
	    [ "`dpkg-query -s yorick|grep Status`" = "Status: purge ok not-installed" ]; then
	    rm -Rf /etc/yorick
	fi
	if [ -e /etc/emacs/site-start.d/50yorick-auto.el ]; then
	    rm -f /etc/emacs/site-start.d/50yorick-auto.el
	fi
	;;
esac
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