Change the default program In debian

Change the default program In debian-Debian information in the Linux release. For more information, see. In debian, you can use the update-alternative command to change the default command.
For example, there are vi, emacs, nano and other editors in the system, but a default editor is required. In debian, the default value is nano.
For example, when the fc command is executed, the nano will be used to load the bash command line.
If you want to change to vi, you need the update-alternative command. For example, execute update-alternative? All.
All Optional options are provided for you to choose from.
You can change the editor and window manager.

Of course, update-alternative has more functions. For more information, see man pages.