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I saw some document, it said that if we edit the file /etc/sudoers. It is a must to use "visudo" instead of " vi ". Is it true ? However your respond is the " Vi " teaching meterial. is it mean that I use continue to use " visudo " to access the file /etc/sudoers and use " Vi " to edit and save the file.
actually means write to disk and quit-no-changes; but because you've already written to disk, using q is fine.
In any case, visudo is basically vi with a fancy frontend to check sudoers file syntax.
If you know what you're doing, any editor will do.
iirc, there's also vipw, vigr for the same reason.
The reason for using visudo is that it checks the alterations before saving the file, and stops you doing anything bad. But you don't need to understand vi to use visudo: the command EDITOR=nano will make visudo use nano instead; you could even do EDITOR=gedet if that takes you fancy. If you put
export EDITOR=nano
in ~/.bashrc that will make nano (or whatever) the default permamently.
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