All,

Is there a way to get a list of users who are logged on to the system
and using a particular filesystem. (i.e) their current directory (pwd)
is the /examplefs or their subdirectories.

I will eventually have to send a message to those users at a particular
time. I bielieve i can use wall for that.

Thanks
-Visu

Visu wrote:
> All,
>
> Is there a way to get a list of users who are logged on to the system
> and using a particular filesystem. (i.e) their current directory (pwd)
> is the /examplefs or their subdirectories.
>
> I will eventually have to send a message to those users at a particular
> time. I bielieve i can use wall for that.
>
> Thanks
> -Visu
>
There is no simple way I can think of. My guess is you wish to umount
that fs? Anyway, you could alias /usr/bin/cd to a custom script that
simply logged usernamewd to some file, then called real cd in the end.

presuming you are trying to umount the filesystem, try fuser, you may
need to issue this on both the filesystem and its underlying device.
it will show the processes using that device-leading you the user(s)

There are two ways to check for that.
Please forget about unmounting filesystem just to check
if it is used. I suppose it was just jokes, or answers
of people not used to deal with production servers ;-)

1) Use lsof (check at IBM download site) (LiSt Open Files).
This tool is wonderful to know about open ports & files.

2) If you use AIX 5.x, you can look a /proc/<PID>/cwd

But this will give you information only about currrent
directories of any proces. My favourite is Answer one.

Er, as it spells, wall is intended to "Write to ALL users".
You could use it to warn yours users, or you can separately
warn them with the "write" utility.

Kind regards,
Stephane