prerm is in latex-cjk-chinese 4.8.4+git20170127-2.
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 | #!/bin/sh
set -e
# Automatically added by dh_installdeb/10.10.5ubuntu1
dpkg-maintscript-helper rm_conffile /etc/texmf/hyphen.d/20latex-cjk-chinese.cnf 4.8.2\+git20111216-1 -- "$@"
dpkg-maintscript-helper rm_conffile /etc/texmf/language.d/20latex-cjk-chinese.cnf 4.8.2\+git20111216-1 -- "$@"
# End automatically added section
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