download google drive file by shell script

參考了 afun 大大的文章，並把他擴充成大小通吃的類型。

	download_from_gdrive() {
	file_id=$1
	file_name=$2 # first stage to get the warning html
	curl -L -o $file_name -c /tmp/cookies \
	"https://drive.google.com/uc?export=download&id=$file_id"
	if grep "Virus scan warning" $file_name > /dev/null;then
	# second stage to extract the download link from html above
	download_link=$(cat $file_name | \
	grep -Eo 'uc-download-link" [^>]* href="[^\"]*' | sed 's/\&/\&/g' | sed 's/.*href="\(.*\)/\1/')
	#grep -Po 'uc-download-link" [^>]* href="\K[^"]*' | \
	#sed 's/\&/\&/g')
	if [ ! -z "$download_link" ];then
	curl -L -b /tmp/cookies \
	"https://drive.google.com$download_link" > $file_name
	fi
	fi
	}
	# download_from_gdrive <FILE_ID> <OUTPUT_FILENAME>
	# ex.
	# download_from_gdrive 1Eveuc2Yd12ehBmM-pmNde4ij1IUXDRMF 60w_tokey.txt # small
	# download_from_gdrive 1VwjLCVfByaO5ywBFg_nmjp9RlJBRevCk 60w_token.txt # large

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