he im new with linux but i love it..............................
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Welcome, I hope you have a lot of fun
The Ubuntu forums are very helpful for new people, and many communities are quite good about answering questions. There are still some jerks around, but don't let them dissuade you.
You're not texting to your buds on your cell phone here.
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Sudo gives you, the user, "Super User" [aka admin] privileges by using your ordinary user password.
On some distro's the privilege has to be added manually.
You won't use it until you're performing a function normally reserved for su,, the super user.
You won't see your password being typed because that's a security measure to prevent others from looking over your shoulder when you type your password.
Actually, su = substitute (or switch) user, not 'Super User'; that's an urban myth. http://linux.die.net/man/1/su
It's often used by root (the real super user) during boot and some cron jobs to run a cmd as a another user eg Oracle startup.