#!/bin/bash
#rename file extesions
#
#       rfe.sh old_extensions new_extension
#
#example:
#to rename al *.gif file in working directory to *.jpg
#       rfe.sh gif jpg
ARGS=2
E_BADARGS=65
if [ $# -ne "$ARGS" ]
then
        echo "Usage:`basename $0` old_file_suffix new_file_suffix"
        echo -e "suffix don't oninclude dot symbol"
        exit $E_BADARGS;
fi
for filename in *.$1
# travers list of files ending with 1st argument.
do        
	mv $filename ${filename%$1}$2        
	#strip off part of filename matching 1st argument,        
	#+ then append 2nd argument.
done
exit 0