This file is indexed.

postinst is in automake 1:1.14.1-4+deb8u1.

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

ver=1.14
prio=32

update-alternatives --install /usr/bin/automake automake \
	/usr/bin/automake-$ver $prio \
	--slave /usr/bin/aclocal aclocal /usr/bin/aclocal-$ver \
	--slave /usr/share/man/man1/automake.1.gz automake.1.gz \
	/usr/share/man/man1/automake-$ver.1.gz \
	--slave /usr/share/man/man1/aclocal.1.gz aclocal.1.gz \
	/usr/share/man/man1/aclocal-$ver.1.gz