There is a comprehensive section on this in the manual for 9.0 but I hate being that guy that says read the book
in a shell script to start CMOD, I have:
arssockd -S -I instance
to stop
arssockd -T -I instance
this can also depend on your infrastructure, how many library servers/object servers you have, etc. the ARSLOAD process is usually customized depending on business need, so read the doc on that too.
Welcome to the CMOD world!
