treehouses usb remove cat

[LordJashin32]

• Useless use of cat: https://en.wikipedia.org/wiki/Cat_(Unix)#Useless_use_of_cat
• https://stackoverflow.com/questions/7427262/how-to-read-a-file-into-a-variable-in-shell

Tested on RPi4 Successfully:

# NOTE MUST HAVE ETHERNET CORD PLUGGED INTO PI TO TEST THIS
pi@raspberrypi:~/Documents/cli $ sudo ./cli.sh usb off
The ethernet port on your Raspberry Pi 4 is connected. Turning off usb power will interfere with your ethernet connection. Do you wish to continue? Y or NN

[vmnet8]

pi@treehouses:~/git_repo/cli $ sudo ./cli.sh usb off
usb ports turned off

it works well without 'cat'