else
echo 'The file does not exists!'
fi
输出：
The file already exists!
另外，Shell还提供了与( ! )、或( -o )、非( -a )三个逻辑操作符用于将测试条件连接起来，其优先级为：“!”最高，“-a”次之，“-o”最低。例如：
cd /bin
if test -e ./notFile -o ./bash
then
echo 'One file exists at least!'
else
echo 'Both dose not exists!'
fi
输出：
One file exists at least!
