Mac OS X 10.7.2 lion modify and add Environment Variables

Mac OS X environment variable settings

First, check the shell:

Run echo $ Shell
If the output is CSH or tcsh, It is C shell.
If the output is Bash, sh, zsh, It is a variant of the Bourne shell.
Before Mac OS X 10.2, the default value is C shell.
The default value after Mac OS X 10.3 is the Bourne shell.

(1) if it is a Bourne shell.

Directly modify the file in. profile or. bash_profile in the main directory. If the file does not exist, generate one.
Usermatomacbook-Pro :~ User $ Pico. Profile // or use VI/vim.

For example, you need to add the path of tools in the Android-SDK to path (Android later moved some common tools such as ADB from tools to platform-tools), and then write it like this:

Export Path = $ path:/Android-SDK-MacOSX/tools
 
(2) c Shell
Just like (1), the edited file name is. cshrc.
Pico. cshrc