Google Drive large file download script using curl

curl-download.sh

#!/bin/bash

# Based on http://blog.mclain.ca/download-large-files-from-google-drive-via-curl/
# Usage: ./curl-download.sh file_id

file_id=$1

if [[ -z "$file_id" ]]; then
  echo "ERROR - file_id is missing"
  echo "      Usage: ./curl-download.sh file_id"
  exit 1
fi

echo "" > ./cookie.txt

echo "accessing ${file_id}"

filename=`curl -c ./cookie.txt -s -L "https://drive.google.com/uc?export=download&id=${file_id}" \
| perl -nE'say/uc-name-size.*? href=".*?\">(.*?)</' \
| sed -e 's/amp;//g' | sed -n 2p`


if [[ -z "$filename" ]]; then
  echo "ERROR -  filename is missing"
  exit 2
fi

query=`curl -c ./cookie.txt -s -L "https://drive.google.com/uc?export=download&id=${file_id}" \
| perl -nE'say/uc-download-link.*? href="(.*?)\">/' \
| sed -e 's/amp;//g' | sed -n 2p`
url="https://drive.google.com$query"

echo "Downloading ${filename}"

curl -b ./cookie.txt -L -o "${filename}" $url && echo "${filename} downloaded"