#!/bin/bash
# Script: renames a file -- Bourne shell

if (( $# < 2 ))     # Argument checking
then
	echo "Usage: $0 file1 file2 " 1>&2
	exit 1
fi

if [ -f $1 ]        # Check for file existence
then
	mv $1 $2        # Rename file1
	echo $1 has been renamed to $2
else
	echo "$1 doesn't exist"
	exit 2
fi