Hi!
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can i hide any user account or group in linux , if yes then how .
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If you are 'outside', and you use text mode, the users are hidden; if you use kde or anything similar, you can hide the users (go to kde control center, if you use kde, of course).
When you log in, you cannot hide the users because you need the file '/etc/passwd' to be readable for every user, and there you can find the usernames.
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and also please tell me how can i check all the user accounts plus groups on my linux machine.
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well, in the '/etc/passwd' are the usernames and in '/etc/group' are the groups with the corresponding users (again, go to kde control center or use the 'linuxconf' program)
Regards