This file is indexed.

postinst is in xpilot-ng-client-x11 1:4.7.3-2.3ubuntu1.

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 ]; then
    # Add an alternative for xpilot and xpilot-ng
    # - we prefer xpilot-ng-x11 over xpilot for 'xpilot' as it is a
    #   superset of xpilot functionality
    update-alternatives --install /usr/games/xpilot xpilot \
        /usr/games/xpilot-ng-x11 20
    # - but only make x11 version "normal" priority for xpilot-ng,
    #   as the SDL version is expected to be better when it is
    #   ready
    update-alternatives --install /usr/games/xpilot-ng xpilot-ng \
        /usr/games/xpilot-ng-x11 10
fi