03-10-2008
Identifying RF users
HP-UX
All,
I work in a manufacturing environment where some users connect to our Progress-based system with wireless RF units (Bar-code). Sometimes they go out of range and get disconnected but their session remains alive (ghost sessions). This sometimes causes record lock problems and is a pain.
1) Is there a way to identify such ghost sessions?
Also, the sys-admins would like to be able to identify who is logged in with RF units. I came up with the idea of having the users' profile launch a backfround ksh script that does nothing(!) but remain in memory for the duration of the session. The name of the script would look something like: "RF-joeblow.sh".
We would generate and run this script as a background job when the user logs in and selects the RF option from his menu. This way we can ps|grep for the 'RF' keyword and see who our RF users are.
2) What command should I put inside this script to have it do nothing but remain active until the session ends. I thought about "sleep 100000" but I am not sure how cpu-consuming this could be? Any ideas?
Thanks!
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last(1) General Commands Manual last(1)
Name
last - indicate last logins of users and teletypes
Syntax
last [-N] [name...] [tty...]
Description
The command looks back in the file, which records all logins and logouts, for information about a user, a teletype or any group of users
and teletypes. Arguments specify names of users or teletypes of interest. Names of teletypes can be given fully or abbreviated. For
example `last 0' is the same as `last tty0'.
If multiple arguments are given, the information that applies to any of the arguments is printed. For example, `last root console' lists
all of "root's" sessions as well as all sessions on the console terminal.
The command prints the sessions of the specified users and teletypes, most recent first, indicating the times at which the session began,
the duration of the session, and the teletype on which the session took place. If the session is ongoing or was cut short by a reboot,
indicates that this is so.
The pseudo-user reboot logs in at reboots of the system. Therefore, the following example gives an indication of mean time between reboot:
last reboot
The command with no arguments prints a record of all logins and logouts, in reverse order.
If is interrupted, it indicates how far the search has progressed in If interrupted with a quit signal (generated by a <CTRL/E>) indicates
how far the search has progressed so far, and the search continues.
Options
-N Limits the number of output lines to the specified number.
Files
/usr/adm/wtmp
login data base
/usr/adm/shutdownlog
records that shutdowns occurred and why
See Also
wtmp(5), ac(8), lastcomm(1)
last(1)