Mac Dock lock command generator

macOS can lock the Dock. Apple just never gave you a switch for it.

These are the real settings, the same ones any app for this uses underneath. Set your Dock exactly how you want it first, because these freeze whatever is in place when you run them.

Your commands

Paste this into Terminal and press Return. Applications, then Utilities, then Terminal.

Things worth knowing before you run it

The killall Dock at the end is not optional. The preference changes without it, but the Dock keeps running with the old one, so it looks like nothing happened.
System Settings will go grey. The matching control stops responding and macOS says the setting has been configured by a profile. That is expected, and it is why people panic about it months later.
Nothing records what your Dock looked like before. If you lock at the wrong size there is nothing to go back to except dragging the divider by hand.
magnification-immutable does nothing. It appears on several sites as a fifth lock. It has no effect, and we tested it.
It only applies to your user account. Another account on the same Mac has its own unlocked Dock. For a shared Mac you need a configuration profile instead.

If you find yourself running these more than once, that is the whole reason Still Dock, an app that locks your Mac's Dock, exists. Same four settings, as switches in the menu bar, and it remembers the Dock you had before you locked it so you can always get back to it.

The commands above stay free either way. Terminal, profile and app compared.