This file is indexed.

postinst is in rc 1.7.4-1.

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.

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#!/bin/sh
set -e

if [ "$1" = "configure" ] && [ -z "$2" ]; then
    add-shell /usr/bin/rc
fi