postinst is in libpam-ssh 2.1+ds1-2.
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22  | #!/bin/sh
set -e
case "$1" in
	configure)
		if [ -f /etc/init.d/libpam-ssh ]; then
			echo -n "Removing trailing old script.."
			update-rc.d -f libpam-ssh remove > /dev/null 2>&1
			echo -n "."
			rm -f /etc/init.d/libpam-ssh > /dev/null 2>&1
			echo "Ok."
		fi
		## Install setup files in /usr/share/pam-configs.
		pam-auth-update --package
		;;
	abort-upgrade|abort-remove|abort-deconfigure)
		## Do nothing.
		;;
	*)
		echo "postinst called with unknown argument \`$1'" >&2
		exit 1
		;;
esac
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