This file is indexed.

postinst is in isc-dhcp-client 4.3.1-6+deb8u3.

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

# Source debconf library.
. /usr/share/debconf/confmodule

case "$1" in
    configure)
        if [ ! -e /var/lib/dhcp/dhclient.leases ]; then
            if test -e /var/lib/dhcp3/dhclient.leases; then
                cp /var/lib/dhcp3/dhclient.leases /var/lib/dhcp/dhclient.leases
            else
                touch /var/lib/dhcp/dhclient.leases
            fi
        fi

        ;;

    abort-upgrade|abort-remove|abort-deconfigure)
        exit 0
        ;;
    
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 0
        ;;
esac