convert Google Shared Link to Downloadable Link

convertGoogleSharedLinktoDownloadableLink.sh

#!/bin/bash
# Convert Google Drive shared link to a link that allows you to perform a direct download 

downloadLink="https://drive.google.com/uc?export=download&id="

function usage (){
  echo "${0}" '-u "url" -f "fileName"'
}

function convertURL (){
	local url="$1"
	uniqueID="$(echo "$url" | awk -F"id=|&" '{print $2}')"
	printf "\n%s\n" "<${downloadLink}${uniqueID}>"
}


while getopts ":u:f:" opt; do
  case "$opt" in
    u) url=$OPTARG ;;
    f) fileName=$OPTARG ;;
    *) usage 
	   exit;;
  esac
done

if [[ -n "$url" ]]; then
	convertURL "$url"
elif [[ -n "$fileName" ]]; then
	while IFS= read -r urlEntry
	do
		convertURL "$urlEntry"
	done < "$fileName"
else
	usage
	exit
fi