This file is indexed.

postinst is in erlang-manpages 1:19.2.1+dfsg-2+deb9u2.

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
# postinst script for erlang-manpages
#
# see: dh_installdeb(1)

set -e

if [ "$1" = configure ] && dpkg --compare-versions "$2" lt-nl "1:12.b.1" ; then
    for name in dialyzer \
		epmd \
		erl \
		erl_call \
		erlc \
		escript \
		run_erl \
		start ; do
	dpkg-divert --package erlang-manpages --remove --rename \
		    --divert /usr/share/man/man1/$name.erlang.1.gz \
			     /usr/share/man/man1/$name.1.gz >/dev/null
    done
fi