HOW TO EDIT PATH VARIABLES IN MAC - 1. Open terminal and enter the following command - touch ~/.bash_profile; open ~/.bash_profile This will open the bash_profile in text editor 2. Add the following line to the end of the file adding whatever additional directory you want in your path: export PATH="$HOME/.rbenv/bin:$PATH" 3. Save the .bash_profile file and Quit (Command + Q) Text Edit. 4. Force the .bash_profile to execute. This loads the values immediately without having to reboot. In your Terminal window, run the following command. source ~/.bash_profile Voila ! You are done. Check your Path vars by typing echo$PATH in the editor. Multiple path environment variable setup with bash - export PATH = "A" export PATH = "$PATH:B" export PATH = "$PATH:C"