$ wp plugin install user-switching --activate
Installing User Switching (1.0.9)
Downloading installation package from https://downloads.wordpress.org/plugin/user-switching.1.0.9.zip...
Unpacking the package...
Installing the plugin...
Plugin installed successfully.
Activating 'user-switching'...
Plugin 'user-switching' activated.
Success: Installed 1 of 1 plugins.