Running 'echo' command in HA

Trying to (re)link lightwave connect hub to HA - got the YAML file, but posts suggest I need to run a nacho command in my HA instance. I run HA in a virtual machine, and so have the HA shell available - which doesn’t have an echo command. So how do I do it?

answer: use the terminal command on the HA interface, and it’ll work in there.