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The only reasons i can come up with for having a 'hidden' user on the system is that a.) it's not your system or b.) you have users on your system that you don't want to know of other users. This is quite easy to fix, just add the main user you use to the group "wheel" or create another group and add your user to that, then go around and chmod o-rwx on programs like w, last, who. There's other ways of seeing who is on the box via 'ps aux', so you can look at a kernel patch like 'grsec' that allows you to restrict 'ps' abilities. Overall, if you are loking about 'hiding' a user on your own system, tighten security. If you are looking to 'hide' a user on a system that isn't yours, what are you doing there :P
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