This file is indexed.

prerm is in csh 20110502-2ubuntu1.

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

if [ "$1" = remove ]; then
	update-alternatives --remove csh /bin/bsd-csh

	if which remove-shell >/dev/null 2>&1; then
		remove-shell /bin/csh
	fi
fi