Add Command Location to $PATH in Mac/Linux

$PATH = all of the places your MAC looks for one word Terminal commands/apps
So that when your type a command into Terminal, like 'git', MAC will know where to look for it.

EXAMPLE (replace with your directory): /opt/bin

STATUS 

1. Terminal
2. echo $PATH

ADD

1. Terminal
2. Add at beginning: PATH=/opt/bin:$PATH
   Add at end: PATH=$PATH:/opt/bin  

USER RESET

export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

MASTER
nano /etc/environment

Reference