MAC 操作系统的全局环境变量不像其他linux的设置方式，mac下需要用launchd launchctl来进行设置。
Here are the steps necessary to setup Environment Variables in Mountain Lion:
- Open a Terminal Window.
-
Use the command ‘sudo nano /etc/launchd.conf’.
- Enter your password.
- Add the environment variables using the following syntax:
setenv NAME_OF_VARIABLE valueOfTheVariable
- Press ‘Ctrl + o’ to save the file
- Press enter to accept the name of the file
- Press ‘Ctrl + x’ to exit the editor.
参考资料：
Setting environment variables in OS X?
http://stackoverflow.com/questions/135688/setting-environment-variables-in-os-x
Environment Variables and Mountain Lion
http://david-martinez.tumblr.com/post/28083831730/environment-variables-and-mountain-lion
Mac OS X Global Environment Variables
http://www.digitaledgesw.com/node/31
比较奇怪的是，
OS X Yosemite 10.10 又不用这个文件了， 又改回去用 /etc/profile 文件了。
修改profile文件：
#vi /etc/profile
在里面加入:
export PATH=”$PATH:/opt/au1200_rm/build_tools/bin”
想立即生效请运行：
#source /etc/profile
不报错则成功。
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