Update alternatives
To alter the “alternative” of one:
update-alternatives --config <name>
Fx.:
update-alternatives --config editor
List alternatives:
update-alternatives --list <name>
Fx.:
$ update-alternatives --list editor
/bin/ed
/bin/nano
/usr/bin/mcedit
/usr/bin/vim.tiny
Set an alternative directly:
update-alternatives --set editor /usr/bin/vim.tiny