allows you do non-interactively download large public files from gdrive

fetch_gdrive_file.sh

#!/bin/bash

SOURCE="$1"
if [ "${SOURCE}" == "" ]; then
    echo "Must specify a source url"
    exit 1
fi

DEST="$2"
#if [ "${DEST}" == "" ]; then
#    echo "Must specify a destination filename"
#    exit 1
#fi

FILEID=$(echo $SOURCE | rev | cut -d= -f1 | rev)
COOKIES=$(mktemp)

CODE=$(wget --save-cookies $COOKIES --keep-session-cookies --no-check-certificate "https://docs.google.com/uc?export=download&id=${FILEID}" -O- | sed -rn 's/.*confirm=([0-9A-Za-z_]+).*/Code: \1\n/p')

# cleanup the code, format is 'Code: XXXX'
CODE=$(echo $CODE | rev | cut -d: -f1 | rev | xargs)

# if no $DEST, auto fetch filename, otherwise use $DEST as filename
if [ -z "$DEST" ]; then
    # option --content-disposition to auto fetch filename
    wget --content-disposition --load-cookies $COOKIES "https://docs.google.com/uc?export=download&confirm=${CODE}&id=${FILEID}"
else
    wget --load-cookies $COOKIES "https://docs.google.com/uc?export=download&confirm=${CODE}&id=${FILEID}" -O $DEST
fi

rm -f $COOKIES