) View the current user and user group in Linux

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View the current Login User
$ Who
Loongson tty7 2012-04-27 08:58 (: 0)
Loongson pts/0 2012-04-27 (: 0.0)
Loongson pts/1 (: 0.0)
Loongson pts/2 (: 0.0)

$ Finger
Login Name TTY Idle login time office phone
Loongson tty7 12 Apr 27 08:58 (: 0)
Loongson pts/0 4 Apr 27 (: 0.0)
Loongson pts/1 Apr 27 (: 0.0)

View user information
$ Finger loongson
Login: loongson name: loongson
Directory:/home/loongson shell:/bin/bash
On since Fri Apr 27 08:58 (CST) on tty7 from: 0
13 minutes 52 seconds idle
On since Fri Apr 27 (CST) on pts/0 from: 0.0
5 minutes 50 seconds idle
On since Fri Apr 27 (CST) on pts/1 from: 0.0
No mail.
No plan

View User Groups
$ Groups loongson
Loongson: loongson ADM dialout CDROM plugdev lpadmin admin sambashare lib1_d

Add a user to a specified group:
# Usermod-a-g testgroup loongson