topic Re: Who command problem in Operating System - HP-UX

Who command problem

Manuel Gómez González — Tue, 28 Feb 2006 10:28:28 GMT

Hi all,

we used to manage user maximum sessions allowed by using "who command".

Some of our users .profile scripts manage user sessions with a command line similar to this atached:

taller='who|cut -c1-6|grep taller|wc -l'

We discover today that some user sessions are not reported by who command... i.e. whe launched 3 taller user sessions and "who" reports only one line containing info about taller.

Can anyone help? This mechanism is working for a few years (5) without a problem.

HPUX version is 10.20.

Thanks.

Re: Who command problem

AshishJain_USA — Tue, 28 Feb 2006 10:33:54 GMT

Some smart user may have manipulated their .profile file.

Re: Who command problem

Manuel Gómez González — Tue, 28 Feb 2006 10:37:44 GMT

.profile is ok without manupulations.

Thank you

Re: Who command problem

A. Clay Stephenson — Tue, 28 Feb 2006 10:42:43 GMT

Your utmp and/or wtmp files are probably corrupt. You could try to export/import them using fwtmp and clean them up or simply null the files. Man fwtmp for details.

Re: Who command problem

Geoff Wild — Tue, 28 Feb 2006 10:43:12 GMT

Instead of cut, use awk

'who|awk '{print $1}'|grep taller|wc -l'

What about using last?

last |grep logged |grep taller |wc -l

Rgds...Geoff

Re: Who command problem

Manuel Gómez González — Tue, 28 Feb 2006 10:55:29 GMT

Clay:

So I can reset utmp file with a simply echo > /etc/utmp?
From the moment utmp is null, who does not return any value until some user log into the system?

Geoff:

'who|awk '{print $1}'|grep taller|wc -l'

It wonÂ´t because who returns only a taler user line.

What about using last?
ast |grep logged |grep taller |wc -l

I guess it could work.

Thanks