This switches every wireless interface into a powered-down state at the NetworkManager level, which can cut power use and force traffic onto wired connections. It is a software toggle, so no hardware is touched and the change can be reversed instantly. Re-enable with nmcli radio wifi on, or use rfkill to also involve the kernel-level switch.
Looking for more? Search all 7,657 commands — works offline, in English or Spanish, and fixes typos.