Small helper script to diff the probe output of "ddccontrol - d"

ddcdiff.sh

#!/bin/bash

Help() {
   # Display Help
   echo "DDCDiff is a tool to help finding the manual changes while querieing the monitor."
   echo
   echo "Syntax: ./ddcdiff.sh [dev]"
   echo "options:"
   echo "dev:   device, e.g. ./ddcdiff.sh dev:/dev/i2c-0"
   echo "h  :   Print this Help."
   echo
}

Probe() {
    # Probe function
    echo "Probing current state..."
    CURRENT=$(ddccontrol -d $DEVICE)
    
    echo "Now make your changes and press any key to continue"
    read -n 1 -s

    echo "Probing changed state..."
    CHANGED=$(ddccontrol -d $DEVICE)

    echo "Diffing output"
    diff <( echo "$CURRENT" ) <( echo "$CHANGED" )
}

# Get the options
while getopts ":h" option; do
   case $option in
      h) # display Help
         Help
         exit;;
     \?) # incorrect option
         echo "Error: Invalid option"
         exit;;
   esac
done

DEVICE=$1
if [ -z $DEVICE ]; then
    DEVICE="-p"
fi

while :
do
echo "1. Probe"
echo "2. Quit"
# echo -n "Type 1 or 2 or 3 :"
read -n 1 -s a
printf "\n"
case $a in
1* )    Probe;;
2* )     exit 0;;

 
* )     echo "Try again.";;
esac
done