Here is an interesting idea...


 
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Old 06-12-2007
Here is an interesting idea...

Does anyone know how to test if an ethernet interface is alive, or accepting connections? Here is the scenario - I have rsc and sc console interfaces on some Suns. There are some sporadic vulnerability scans that send them out to lunch when they run the scans. I have to login to the host and reset the console cards with the software installed on the host, but if the host gets honked up it is the wrong time to find out if my console connection isn't working.
So, I've been thinking about a script that could just check to make sure all of my consoles are alive and if not, I can reset them before something happens. Like maybe
for $IP
do
$some_way_to_check_consoles
done

This would be cool to see, either sh, csh, ksh, whatever!
D
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INIT(8) 						      System Manager's Manual							   INIT(8)

NAME
init - initialize machine upon booting SYNOPSIS
/$cputype/init [ -ctm ] [ command ... ] DESCRIPTION
Init initializes the machine: it establishes the name space (see namespace(4) and newns in auth(2)), and environment (see env(3)) and starts a shell (rc(1)) on the console. If a command is supplied, that is run instead of the shell. On a CPU server the invoked shell runs cpurc(8) before accepting commands on the console; on a terminal, it runs termrc and then the user's profile. Options -t (terminal) and -c (CPU) force the behavior to correspond to the specified service class. Otherwise init uses the value of the environment variable $service to decide the service class. Init sets environment variables $service (either to the incoming value or according to -t or -c), $objtype (to the value of $cputype), $user (to the contents of #c/user), and $timezone (to the contents of /adm/timezone/local). With option -m init starts only an interactive shell regardless of the command or service class. On a CPU server, init requires the machine's password to be supplied before starting rc on the console. Init is invoked by boot(8), which sets the arguments as appropriate. SOURCE
/sys/src/cmd/init.c SEE ALSO
rc(1), auth(2), boot(8) INIT(8)