I use a script It is run in a loop and adds the setting to the Templates, but you can change that and make it run on existing accounts. ${USER_TEMPLATE} is the variable from the loop.

# Mouse secondary button

/usr/bin/defaults write /Library/User\\ Template/${USER_TEMPLATE}/Library/Preferences/com.apple.driver.AppleHIDMouse.plist Button2 -int 2

I have no problem with this running on Monterey.

/usr/bin/defaults write /Users/<USER HOME>/Library/Preferences/com.apple.driver.AppleHIDMouse.plist Button2 -int 2

Should, if you replace <USER HOME> with a valid account, work just fine.

Thanks so much for the quick reply! This worked well for me - not sure why I found it so difficult. BTW, what do you mean by you have it run in a loop? Also, I have seen your solution for deleting existing local accounts and am looking forward to experimenting with it, it looks perfect for lab machines-

A loop will be something like this. This one would loop through all of the folders it finds in the /Users folder, and apply the setting to each one. You really need to refine the output of the ls command, because you want to ignore stuff like the Shared folder.

# Look for User accounts

Accounts=$(ls -l /Users | /usr/bin/awk '{print $9}' | /usr/bin/grep -viE '(shared|Guest|.DS_Store|.localized)')

for UserAccounts in $Accounts

do

/usr/bin/defaults write /Users/$UserAccounts/Library/Preferences/com.apple.driver.AppleHIDMouse.plist Button2 -int 2

done

Ah, so this would be done for existing local accounts. I'm mainly concerned with having it enabled for each new user that logs into these public/lab machines - so I imagine the script alone will suffice.

For the templates you would need something like

$(ls /Library/User\\ Template/ | grep -v "__" )
as the lookup bit of the loop

There are quite a few Templates, and whilst in theory just adding this to the non-localised one should work on its own, I throw it to them all.

# Look for User templates

Templates=$(ls /Library/User\\ Template/ | grep -v "__" )

for USER_TEMPLATE in $Templates

do

/usr/bin/defaults write /Library/User\\ Template/$USER_TEMPLATE/Library/Preferences/com.apple.driver.AppleHIDMouse.plist Button2 -int 2

done

Does this work only for the Apple mouse, we are using wired Logitech mice in our classroom.

It's worth a shot, I imagine right-click on any mouse triggers the same response in the OS, so it seems like it should?

Works on our wired Cherry mouses

Thank you, we are in session not a lot of options to test so I appreciate the feedback