Commands that provide user information.

who - lists login information about who is logged on.

User ID.
Terminal connected to.
Time login established.
ID of system logged in from.


who am i - performs a who on just you.

whoami - lists just your user ID.

finger - lists account information about users.

If applied to a specific user, lists :

User ID.

User's 'real name'

User's home directory

User's default login shell

User's last login time and where they logged in from.

If on, how long they have been on and where they logged in from.
  And if the connection has been idle.

User's plan.
   User can create a file called .plan in their home directory
     containing things such as contact info and availability.

If user has unread mail.


w user - reports login info and computing resources 
  being used by all users logged in. Can specify user to limit scope.

id user - reports user's account info, 
  Real UID, and all groups user belongs to.

  Options target specific portions of available information.

  id -un # equivalent of whoami