On this particular big box:HP-UX frank B.11.00 U 9000/800 75635 unlimited-user license
Which as you see is HP-UX 11, killall is totally different that the linux killall. As we see from the manpage:
killall - kill all active processes
killall is a procedure used by /usr/sbin/shutdown to kill all ac
processes not directly related to the shutdown procedure.
killall is chiefly used to terminate all processes with open fil
that the mounted file systems are no longer busy and can be unmo
killall sends the specified signal to all user processes in the
system, with the following exceptions:
the init process;
all processes (including background processes) associated w
the terminal from which killall was invoked;
any ps -ef process, if owned by root;
any sed -e process, if owned by root;
any shutdown process;
any killall process;
any /sbin/rc process.
killall obtains its process information from ps, and therefore m
be able to perfectly identify which processes to signal (see ps(
If no signal is specified, a default of 9 (kill) is used.
killall is invoked automatically by shutdown The use of shutdown
recommended over using killall by itself (see shutdown(1M)).
fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).
killall: SVID2, SVID3
Hewlett-Packard Company - 1 - HP-UX Release 11.00: Octobe
So, what it does is basically destroys all stubborn running processes still left during a system shutdown. Certainly not the same thing as a Linux killall, which really is just (as far as I can tell) a fancy signal sending multiplexer.
On a marginally related note, be careful and stingy with your kill -9 (and killall's as well)... lest you find yourself recepient of merlyn
's Useless use of kill award