The problem is not that it does not apply to
nano, it's that it does not apply to the shell:
Just set the
VISUAL environment variable:
Add this too ~/.bashrc to make it permanent.
As you seem to use vim in general, set both
or more POSIX-correct
VISUAL="vim" ; export VISUAL
EDITOR="$VISUAL" ; export EDITOR
nano was the value of one or both variables.
To make use of the editor in visudo actually, we need to handle that
sudo does not keep the environment variables by normally. The option
-E changes that.
sudo -E visudo
-E here, you would end up with a default of
The two variables where in use long before files named
mime* even existed.
(And the impressive thing is: they were actually used as a common standard.)
In Ubuntu, the system default seems to be set with
sudo update-alternatives --config editor. It shows a menu to change the current association.
VISUAL Invoked by visudo as the editor to use
EDITOR Used by visudo if VISUAL is not set