Show users
 

How can i list out all the users in the system via command prompt or terminal ?

To get a list of currently logged in users, the command is (suprisingly) users.

Hi,i cant see the difference between users and who command.Both only show the users currently logged in.I am looking or a command to show all usernames,groupnames ,etc so that i can check if their might be a username i dont know of on a server.

Thanks for any reply.Cheers

users is from BSD, who is from SysV Unix.
Indeed
That wasn't your initial question.
A simple way would be "cat /etc/passwd", but that wouldn't take into account authentication made from different database (like NIS, LDAP, etc ...).

(1) cat /etc/passwd is OK for <quote>on a server<UnQuote>
(2) contact your dba

Note that even background processes require a login - may be "anonymous"

End

What do you mean ?
These databases aren't usually handled by dbas but better by system administrators.
Precisely all processes require a userid/groupid, however, they need not to be defined in /etc/passwd or anywhere.