AIX
# startsrc
# stopsrc
# refresh
eg:
# startsrc -s rpc.mountd
# startsrc -g nfs
# stopsrc -s rpc.mountd
# refresh -s inetd
HP-UX
Generally done via the init.d scripts
Solaris
# svcadm
eg:
# svcadm enable nfs
# svcadm disable nfs
# svcadm refresh nfs