#!/bin/bash

# dotrev
# Reverse the order of substrings within a dotted string.
# Example: deboone.nl -> nl.deboone

while [ -n "$1" ]; do
	tmp="$1"
	REVHOSTNAME=""
	while [ -n "$tmp" ]; do
	    piece="${tmp##*.}."
	    tmp="${tmp%.*}"
	    REVHOSTNAME="${REVHOSTNAME}${piece}"
	    if ! case "$tmp" in *.*) ;; *) false;; esac; then
	        REVHOSTNAME="${REVHOSTNAME}${tmp}"
	        unset tmp
	        unset piece
	        break;
	    fi
	done
	echo $REVHOSTNAME
	shift
done