update-alternatives - maintain symbolic links determining default commands

To check for the version update-alternatives $ update-alternatives --version

To choosing the Alternative in Manual Mode With config for editors $ sudo update-alternatives --config editor

To choose the alternative with set $ sudo update-alternatives --list editor /bin/ed /bin/nano /usr/bin/vim.basic /usr/bin/vim.tiny

To choose and set manually vim.basic editor $ sudo update-alternatives --set editor /usr/bin/vim.basic

To set back to auto mode $ sudo update-alternatives --auto editor

Adding New Alternative With install $ sudo apt install emacs

To make emacs editor available in editor options and set 100 as priority $ sudo update-alternatives --install /usr/bin/editor editor /usr/bin/emacs 100 $ /usr/bin/editor will make open emacs as default editor

To list alternatives with get-selections $ sudo update-alternatives --get-selections

regards, T.Dhanasekar