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 6.5.2.15
Looking for versions at: /Users/scottsalisbury/bin/Sencha/Cmd
Current version
6.5.2.15
Newest version installed
6.6.0.13
Locally available versions
6.5.0.180
6.1.2.15
6.2.0.103
6.0.2.14
6.0.1.76
6.5.1.240
6.5.3.6
6.2.1.29
6.5.2.15
6.1.3.42
6.6.0.13
Scotts-MacBook-Pro-2016:scottsalisbury$
Scotts-MacBook-Pro-2016:scottsalisbury$ sencha switch 6.0.1.76
Sencha Cmd 6.0.1.76
Successfully switched to version 6.0.1.76.
Run 'sencha help' to see the available commands on this version.
Scotts-MacBook-Pro-2016: scottsalisbury$