对于奥巴马来说不幸的是，他的行政命令作用有限。
Unfortunately for Mr Obama, his executive order will have limited effect.
在继续学习之前，简单看一下这些基本命令的作用。
Before I move on, take a quick look at what these basic commands do.
CD命令是CHDIR命令的简称，作用是进入某个文件夹。
The CD command is short for the CHDIR command, enter a folder.
如果没有一个相关内容正在作用中，命令就不会显示。
If none of the related contexts are active, then the command is not displayed.
安全限制仅用于全局作用域命令。
Security restrictions are available only as global scope commands.
安全限制仅用于全局作用域命令。
Security restrictions are available only as global scope commands.
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