Not sure if these are valid commands, in that install, they were reported in a Sys Admin book I have, it says it was for, mostly RedHat, but, I found them to exist in Debian - maybe they are "common" Linux commands

This will get you a textual, scroll display, like top, but one-shot EVERYTHING
ps -auxw

This will get you who, and what, is connected or established, in ports
netstat -natu

This will get you what your "portmapper" is showing
rpcinfo -p

Lastly, this was given to me, comes in handy, all users logged in
users

Hope this helps,