学步园

     ㈠ 查看当前在线的所有用户

[root@Rocky ~]# who
root     :0           2013-03-18 13:31
root     pts/1        2013-03-18 18:48 (:0.0)
root     pts/2        2013-03-18 18:48 (:0.0)

     ㈡ 查看某个用户

[root@Rocky ~]# finger oracle
Login: oracle                           Name: (null)
Directory: /home/oracle                 Shell: /bin/bash
Never logged in.
No mail.
No Plan.

     
     ㈢ 查看当前用户

[root@Rocky ~]# who am i
root     pts/1        2013-03-18 18:48 (:0.0)