Rename file or dir by appending current timestamp

gistfile1.sh

# move a file/folder to its name suffixed by the current timestamp
function mvdate() {
	if [ ! -f "$1" -a ! -d "$1" ]
	then
		echo "Error! Given file/folder $1 does not exist! Exiting"
		return 1
	fi

	mv "$1" "$1_$(date +%Y%m%d%H%M%S)"
	OUT=$?
	if [ $OUT -ne 0 ]; then
		echo "Error! renaming file."
	fi
}