The phrase "single command" means giving one instruction or order to control or operate something. It is a straightforward and concise way of directing or managing a task. Full definition
The data from each squad were sent to a single command post, where officers could put together a coherent picture of the entire battle scene. (inc.com)
Speaking to all family members through Echo is now possible with a single command. (techtimes.com)
Galatians 5:14 - 15 — The entire law is summed up in a single command: «Love your neighbor as yourself.» (nakedpastor.com)