Everyone knows that in the crudest sense,
sudo lets you run a command as root, and to be fair that is probably the most useful thing it does. That being the case, such a user cannot be blamed for thinking that
su stood for “Super User”. However, as I found out recently, there is a little more to it than that.
su actually stands for “Substitute User”, and actually it can be used to run a command as any user, not just root. Moreover, so can
Following a number of bad experiences with various IRC clients, the worst being the ones that could not understand that I want a different identity for each network. I do not want to log onto a serious network like Freenode with my silly Rizon nick for example.
The obvious solution is to run a separate IRC client under a separate Unix user for each network and my new found
sudo knowledge helped greatly.
First we need a new user.
Next we need to explain the new kind of behaviour we would like to allow in the suders file (run
visudo to modify it).
What this says is that any user in the wheel group (
%wheel), running on any host (
ALL), may run a command as the user rizon (
(rizon)), without supplying a password (
NOPASSWD:) and the permitted command is weechat (
There’s one extra detail to be aware of and that is the invocation. We must also tell
sudo on the command line that we wish to run the command as a user other than root.