sudo v. su?

[Davka]

Can anyone tell me the difference between sudo and su? I can run sudo commands, but if i type su and enter my password, it gives an authentication error.

Very new to Linuxland, pls b gentle.

[Rog131]

Re: sudo v. su?

> sudo vs. su

...
Unlike su, sudo changes your permissions for only a single command. Once that command completes your permissions revert back to the ones you had when you logged in.
...

> su (Unix) wiki

> sudo wiki

> FAQ: Root Password

I can run sudo commands, but if i type su and enter my password, it gives an authentication error.

I ,think, that su is expecting root password. As default kubuntu don't have it set => error.

You can (Using sudo to become root ):

user@Machine:~$ sudo su -
[sudo] password for user:
root@Machine:~#