第一次写shell

#!/bin/bash
file=/usr/ras/$1
if [ -f $file ]
then
        echo "$file is exist"
        exit 0
else
        echo "$file is not exist"
        if [ -f /home/cie/pkg/ras/$1 ]
        then
                echo "/home/cie/pkg/ras/$1 is exist"
                cp /home/cie/pkg/ras/$1 /usr/ras/
        else
                echo "/home/cie/pkg/ras/$1 is not exist"
                exit 2
        fi
        exit 1
fi