Calculate Percentage of Change

calpoc.sh

#!/usr/bin/env bash

usage(){
  echo "$(basename "$0") start_value end_value"
}

# Check if any flags or values were passed
if [ "$#" -eq 0 ]; then
  usage
  exit
fi


# If the flag for help is passed, display usage
case "$1" in
  -h|--help)
    usage
    exit
  ;;
esac

start_value="$1"
end_value="$2"
scale_value="4"

value="$(bc -l <<< "scale=${scale_value}; ${end_value} - ${start_value}")"
value="$(bc -l <<< "scale=${scale_value}; ${value} / ${start_value}")"
value="$(bc -l <<< "scale=${scale_value}; ${value} * 100")"

echo "${value}"