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Registered Member #143
Joined: Sat Feb 11 2006, 04:25PM
Location: Austin TX, NorAm, Sol III
Posts: 28
I haven't use Ubuntu, but there is a sudo'ers list somewhere on the system that specifies what users can use sudo. If you are not in the list it ignores your command. If you are in the list, it runs the command. Usually, it asks for your password the first time you run sudo, and then remembers it for the next X minutes, resetting the timeout every time you run a sudo command. When the timeout expires, it asks for the password again the next time you use the sudo command to run something.
Since passwd assumes the current user if you don't specify one (passwd <username>), and the sudo command is to allow a "normal" user to run a command as root, then "sudo passwd" tells it you want to (re)set the root password.
Another fun thing is to run "sudo bash" (or whatever shell you prefer to use). You can then run whatever commands you want as root, then type "exit" when you are done to close the shell. Sometimes that is much easier than running a bunch of commands with sudo in front of them.
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