Linux User Commands

uid's
Get uid for a user id USERNAME Information about user-related commands: info coreutils 'user information'

User info
'finger' is used for getting information about users. List real names of all users logged on: $ for x in `users`;do finger $x|grep Name|sed -r 's/^.*Name: (.*)$/\1/';done Jungle Ras Peder Dingo (some users may be listed more than once)

Who is logged on?
Watch logged on users: $ watch -d -n 1 'who -u'

kick user 'schmid': USER      PID %CPU %MEM   VSZ  RSS TTY      STAT START   TIME COMMAND schmid  14366  0.0  1.0  2268 1292 tty3     S    19:32   0:00 -bash schmid  14653  1.1  2.4  6336 3104 tty3     S    19:43   0:02 vim user_management.txt
 * 1) ps au|egrep "^(U|schmid)"

|__ (careful not to kill your own bash!!! :)
 * 1) kill -9 14366

Messaging
Message 'huba' to all users: $ wall huba