AIX Version 4.3 Commands Reference, Volume 6 who Command Purpose Identifies the users currently logged in. The who command displays information about all users currently on the local system. Entering who am i or who am I displays your login name, tty, date and time you logged in. If the user is logged in from a remote machine, then the host name of that machine is displayed as well. Time Represents the time when the user logged in.
Activity Represents the hours and minutes since activity last occurred on that user's line.
If the line has been quiet more than 24 hours or has not been used since the last system startup, the entry is marked as old. Pid Identifies the process ID of the user's login shell. Hostname Indicates the name of the machine the user is logged in from. If you specify another file with the File parameter, the who command examines that file instead. If the File parameter specifies more than one file name, only the last file name will be used.