How can I reset my USB ports via Terminal?

sudo kextunload IOUSBMassStorageClass.kext;

sudo kextload /System/Library/Extensions/IOUSBMassStorageClass.kext

There are other better more effective ways to do this outside of terminal but I assume you cant get into the computer in the first place otherwise you wouldnt be asking for a terminal command.

A way to do it outside of terminal is:

1. Press the  icon in top left of screen
2. Click Shutdown
3. Turn on the Mac while holding down the Command-Option-P-R keys until you hear the second start-up sound.
4. Release the Command-Option-P-R keys.
5. or
   1. Press the  icon in top left of screen
   2. Click Shutdown
   3. Disconnect the MagSafe power adapter from the computer
   4. Remove the battery
   5. Press and hold the power button for 5 seconds
   6. Release the power button
   7. Reconnect the battery and MagSafe power adapter
   8. Press the power button to turn on the computer
6. or
   1. Press the  icon in top left of screen
   2. Click Shutdown
   3. Plug in the MagSafe or USB-C power adapter to a power source and to your computer.
   4. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the  power button at the same time.
   5. Release all the keys and the power button at the same time.
   6. Press the  power button to turn on the Mac laptop.
7.  IF those dont work comment on one of my posts and I will give more methods

The USB doesn’t work, so I cant use any key combination. I thought there might be a way to use the on/off button without rebooting it?

Currently I try to use bluetooth mouse and keyboard to type resetusb (after adding to the profile: alias resetusb='sudo launchctl stop com.apple.usbd; sudo launchctl start com.apple.usbd')

as someone suggested.