System users and groups

LSB requires the following users and groups:

root     root       Administrative user with no restrictions
bin      bin        Administrative user with some restrictions
daemon   daemon     Subprocess special privileges

And adds an optional list:

adm      adm        Administrative special privileges
lp       lp         Printer special privileges
sync     sync       Login to sync the system
shutdown shutdown   Login to shutdown the system
halt     halt       Login to halt the system
mail     mail       Mail special privileges
news     news       News special privileges
uucp     uucp       UUCP special privileges
operator root       Operator special privileges
man      man        Man special privileges
nobody   nobody     Used by NFS