This file is indexed.

postrm is in imagemagick-doc 8:6.9.7.4+dfsg-16ubuntu6.

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

# remove after strech+2
dpkg-maintscript-helper \
	dir_to_symlink /usr/share/doc/imagemagick-doc /usr/share/doc/imagemagick-6-common 8:6.9.2.10+dfsg-1~ -- "$@"