A wrapper script of mv command to change an extension of a file.

suffixer.sh

#!/bin/bash
# $Id: suffixer.sh,v 1.1 2013-10-04 13:34:41+09 shirai Exp shirai $
ArgFile=$1
suffix=$2
main(){
  check_args $@
	mv -vi $ArgFile ${ArgFile%.*}.${suffix}
}

check_args(){
	if [[ ! -e "$ArgFile" && "$suffix" != "" ]];then
		echo " Usage: $0  filename  suffix"
		exit
	fi
}

diae(){
echo $@
$@
}

main $@