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The who command

The who command lets you print out a list of logged-in users, the current run level of the system and the time of last system boot.

Examples

1. Print out all details of currently logged-in users

who -a  

2. Print out the list of all dead processes

who -d -H

Syntax:

who [options] [filename] 

Additional Flags and their Functionalities

Short Flag	Description
-r	prints all the current runlevel
-d	print all the dead processes
-q	print all the login names and total number of logged on users
-h	print the heading of the columns displayed
-b	print the time of last system boot