This file is indexed.

postinst is in i3-wm 4.14.1-1.

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
# Automatically added by dh_installwm/10.10.5ubuntu1
if [ "$1" = "configure" ]; then
	update-alternatives --install /usr/bin/x-window-manager \
		x-window-manager /usr/bin/i3 20 \
		--slave /usr/share/man/man1/x-window-manager.1.gz \
		x-window-manager.1.gz /usr/share/man/man1/i3.1.gz
fi
# End automatically added section