networkmanager --version and nmcli -v are command line instructions that can be entered into the terminal on a Linux system. They are used to display the version number of NetworkManager that is currently installed on the system. NetworkManager is a service that manages network connections on Linux and Unix-like systems.
When you enter the command networkmanager --version or nmcli -v and press enter, the terminal will display the version number of NetworkManager currently installed on your system. This information can be useful for troubleshooting or for checking if you have the latest version of the software.
For example, if you see the output as 1.20.10 this means you have NetworkManager version 1.20.10 installed on your system.