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Who command problem

unicorntech
unicorntech asked
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Medium Priority
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Last Modified: 2010-03-17
Why would when I type the w or who command on Linux would it only show me the first ten dial-up ttys (ie ttyE0 to
ttyE9)?
This makes it hard for me to know how long users have been online. What can I do to either fix it or find out how long users have been online???
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Commented:
finger @that.box.com

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Author

Commented:
But how do I know who to finger if they don't show up using who???

Commented:
Don't finger by name... type it like I had it:
finger @that.box.com

That will tell you everybody logged in.

Author

Commented:
But I still get the same problem it only shows the users from ttyE0 to ttyE9 and when the tty goes to double figures like ttyE11 it doesn't show up???

Author

Commented:
Adjusted points to 75

Commented:
okay.  what about "ps -ax | grep e[0-100]"
make an alias for it of course... don't want to be typing
that every time.

Author

Commented:
Thanks for the comment but that is what I've been doing except I've been doing "ps -ax|grep pppd" and that tells me how many ppp processes are running but not who is using them. What I really need to know is why who doesn't work and what I need to do to fix it. Please help 'cause the comments so far are great!!

Regards,
Jason
May be there are corrupted /etc/{w,u}tmp  (or whereever they
reside) files. Remove them carefully.

Commented:
try "last -20" for last 20 logons. Users who is online now
will be marked as "still logged in", for all other you will
see login/logout/total time.

Of course, you can grep it, if you need only
logged in users. :)

Author

Commented:
I've been looking thru the utmp.h file and found an entry for the length of the tty entry output. This is set to [2] - should I perhaps change this to [3], recompile and reinstall the kernel?

Commented:
Kernel is not responsible for handling [wu]tmp files.
It is responsibility of programs like "login", "getty".
And, many programs depends on format of utmp file.

You can change it, of course, but after this you need
to recompile all programs which use it. At least, you
need to recompile: login, getty, agetty, mgetty, who,
finger, last...

But, look at utmp.h more close: entry, responsible for
storing device (line) name [ut_line], is 12 bytes long. And info
about tty stored here.

Devario JohnsonPrincipal Software Engineer
CERTIFIED EXPERT

Commented:
Does anyone know of a program that tells an administrator can check to see how how long users are logged into a client machine on a network?

Win 2000 pro
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