Determine all users on the Linux machine [closed]

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http://serverfault.com – Possible Duplicate: How to list all users and groups on linux? How to determine all the users on a Linux machine (not only the ones who are logged in)? I searched and found the following command: $ cat /etc/passwd | grep "/home" | cut -d: -f1 But my concern is that I could not find root in the output of above command. Also when I try who command I get the same response when I am logged in a root and as a normal user. Please help! (HowTos)