I have a MacBook Pro (Retina, 15-inch, Early 2013) and tested the following on it.
With my Wi-Fi network adapter turned on and connected, I shutdown my MacBook Pro. (This was to ensure the change I was about to make did indeed disable my Wi-Fi network adapter when rebooted.)
With the MacBook Pro shutdown, I then started it in single-user mode.
Start up in single-user mode or verbose mode
Use these steps to start up your Mac in single-user mode or verbose
- Shut down your Mac.
- Press the power button to start up your Mac.
Immediately hold down the following keys:
- Hold down Command-S for single-user mode.
- Hold down Command-V for verbose mode.
You've successfully entered single-user mode or verbose mode when you
see white text appear on the screen.
In single-user mode, run the following commands:
/sbin/mount -uw /
Once the filesystem has been checked and you've mounted the
/ volume as writable, use the following command to disable the Wi-Fi network service, which will turn off the power to the Wi-Fi network adapter when rebooted into normal mode.
networksetup -setnetworkserviceenabled Wi-Fi off
Now reboot using the
reboot command, type
reboot and press enter.
Once rebooted and in normal mode you can reenable the Wi-Fi network service, thus restoring power to the Wi-Fi network adapter, by doing the following.
In Terminal, use the following command:
networksetup -setnetworkserviceenabled Wi-Fi on
You'll be prompted for your password, as shown in the image below.
Type in your password and click the Modify Configuration button, or press enter.
Note: While in single-user mode, if your wireless network service is not named "Wi-Fi" then use the following command to determine what network services you have.
On my system, after using
networksetup -setnetworkserviceenabled Wi-Fi off the output was:
An asterisk (*) denotes that a network service is disabled.
So, "Wi-Fi" was the right choice for me.
Note: I do not have FileVault enabled and if you do, you may have additional steps to take to access single-user mode.