#!/bin/bash
# Copyright (C) 2016 Ian Kelling

# chost: get canonical hostname

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

host=$1
addr=$(host $host)
addr=${addr##* }
h=$(host $addr)
h=${h##* }
echo ${h%%.*}