This file is indexed.

postrm is in zsh 5.0.2-3ubuntu6.

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

case "$1" in
	(remove)
	remove-shell /bin/zsh
	remove-shell /usr/bin/zsh
	;;
esac