When it comes to shutting down UNIX systems gracefully but without warning, it is nice to know which of the logged-in users have been inactive and for how long. All flavors of UNIX come with the 'who' command, most of which can tell you how long someone has been idle or inactive. The -u option typically reveals the inactivity timer, and the -H option displays an appropriate header for the display, as demonstrated below.
AIX (Activity is a misnomer - it is the idle or Inactivity time)
Name Line & nbsp; Time Activity PID Hostname
root pts/2 Jul 28 20:10 18:10 20202 (:0.0)
userx pts/3 Aug 01 05:12 0:05 3544 (126.96.36.199)
# who -uH
NAME LINE TIME IDLE PID COMMENTS
userx pts/17 Aug 1 06:31 0:04 8844 (192.168.150.209)
usery pts/28 Aug 1 06:31 2:02 8847 (192.168.150.197)
NAME LINE TIME IDLE PID COMMENT
userx pts/0 Aug 1 11:12 0:02 23493 (188.8.131.52)
Tech Tip found on Ashwood Computers website.