#! /bin/bash
#
#   addextension extension filename 
#
#  for example, "addextension .html somefile" 
#  would move somefile to somefile.html
#   
if [ -n "$1" ]
then
    extension=$1
    shift	
    for filename in "$@" ; do
	`mv $filename ${filename}${extension}`
    done
else
	echo "error no arguments given"
fi