DESCRIPTION
 The 
rwho command produces output similar to 
who(1), but for all machines on the local network. If no report has been received from a machine for 11 minutes then 
rwho assumes the machine is down, and does not report the users last known to be logged into that machine.
If a user hasn't typed to the system for a minute or more, then rwho reports this idle time.
- 
-a
- 
Include all users. By default, if a user hasn't typed to the system for an hour or more, then the user will be omitted from the output.
- 
-H
- 
Write column headings above the regular output.
- 
-q
- 
“Quick mode”: List only the names and the number of users currently logged on. When this option is used, all other options are ignored.