Sometimes it is handy and necessary to change the Sencha Cmd version without having to play around with your path and hand-juggle multiple versions.
Here are some simple steps to check which version is running, see which versions you have installed and finally a step to actually change the currently running version.
Scotts-MacBook-Pro-2016:scottsalisbury$ sencha switch --list
Sencha Cmd 188.8.131.52
Looking for versions at: /Users/scottsalisbury/bin/Sencha/Cmd
Newest version installed
Locally available versions
Scotts-MacBook-Pro-2016:scottsalisbury$ sencha switch 184.108.40.206
Sencha Cmd 220.127.116.11
Successfully switched to version 18.104.22.168.
Run 'sencha help' to see the available commands on this version.