Messages in this thread |  | | Date | Mon, 5 Nov 2001 19:20:52 -0600 (CST) | From | Chris Abbey <> | Subject | Re: How can I know the number of current users in the system? |
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Today, Riley Williams wrote: > Here's a simple shell command to provide that information: > > who | wc -l > > Try it and see...
Actually that's not a fair count of the number of users on the box, only the number that are *logged in*. On one of our boxes at work, that would miss about 80% of the users, maybe more. Anyone that RSH's or SSH's in without a tty wouldn't be counted:
cabbey@CHESIRE ~> ssh -T tweedle who cabbey@CHESIRE ~>
so even though I was executing who on tweedle it didn't see me logged in. A more realistic situation:
[cabbey@tweedle cabbey]$ who cabbey pts/0 Nov 5 19:05 cabbey pts/1 Nov 5 19:05 [cabbey@tweedle cabbey]$
pts/0 is my pine session, pts/1 is the shell I executed who in, there are also two copies of "xeyes" running back to chesire that were started as 'ssh -T tweedle /usr/X11r6/bin/xeyes -display chesire:0' but don't appear in who
going back to running it remotely:
cabbey@CHESIRE ~> ssh -T tweedle who cabbey pts/0 Nov 5 19:05 cabbey pts/1 Nov 5 19:05 cabbey@CHESIRE ~>
If those were move cpu hungry programs than xeyes, like vncserver with a complete kde/gnome desktop running under it then you could really be missing some data from a scheduling pov... which as I recall was what the original poster wanted to fiddle with.
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