About 10 minutes before you plan to begin the backup, use the WARN
command to send a message to all users asking them to log off the
system.
Unlike the TELL command, the WARN command interrupts users
working in QUIET mode so that you can be sure they know about the
impending backup. Enter the command below, substituting the time you
intend to begin the backup for hh:mm.
:WARN @S; BACKUP WILL BEGIN AT hh:mm. PLEASE LOG OFF
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Now that everyone has been warned, find out who is still using the system.
Enter:
The system responds by listing all sessions. Since you have already
told users about the backup once, and warned them again, most users
should have ended their sessions. Periodically use the SHOWJOB
command to see who is still logged on to the system.