This file is indexed.

postrm is in libgvc6-plugins-gtk 2.38.0-12ubuntu2.

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

# Update the configuration file (/usr/lib/graphviz/config6a)
if [ -x /usr/sbin/libgvc6-config-update ]; then
	libgvc6-config-update -c
fi