mac,ubuntu   環境變量

Mac OS X

1. Open the .bash_profile file in your home directory (for example, /Users/your-user-name/.bash_profile) in a text editor.
2. Add export PATH="your-dir:$PATH" to the last line of the file, where your-dir is the directory you want to add.
3. Save the .bash_profile file.
4. Restart your terminal.

Linux

1. Open the .bashrc file in your home directory (for example, /home/your-user-name/.bashrc) in a text editor.
2. Add export PATH="your-dir:$PATH" to the last line of the file, where your-dir is the directory you want to add.
3. Save the .bashrc file.
4. Restart your terminal.