prerm is in latex-cjk-chinese-arphic-bsmi00lp 1.23.
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.
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#!/bin/sh set -e # Automatically added by dh_installdeb dpkg-maintscript-helper rm_conffile /etc/texmf/updmap.d/20latex-cjk-chinese-arphic-bsmi00lp.cfg 1.21+nmu1 -- "$@" # End automatically added section