Create a nessusd certificate
/usr/local/sbin/nessus-mkcert
Add a nessusd user use
/usr/local/sbin/nessus-adduser
Start the Nessus daemon
/usr/local/sbin/nessusd -D
Start the Nessus client
/usr/local/bin/nessus
To uninstall Nessus
/usr/local/sbin/uninstall-nessus
Update your list of plugins
/usr/local/sbin/nessus-update-plugins