prerm is in bsd-mailx 8.1.2-0.20131005cvs-1ubuntu0.14.04.1.
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 | #!/bin/sh
# vim:ts=2:et
# $Id: bsd-mailx.prerm,v 1.2 2007-12-01 12:06:49 robert Exp $
set -e
if [ "$1" = "remove" ]; then
update-alternatives --remove "mailx" "/usr/bin/bsd-mailx"
fi
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