Download any Google Font with its corresponding CSS rules.

get-google-fonts.sh

#!/bin/bash

FONT_NAME="$1"           
FILE_NAME=$(echo $FONT_NAME | tr '[:upper:]' '[:lower:]' | tr ' ' '-')
URL_NAME=$(echo $FONT_NAME | tr ' ' '+') 

FILE=$FILE_NAME"-font.css"
FONT_FOLDER="web-font"
AGENT_WOFF="Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko"
AGENT_WOFF2="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like $

# download css as IE11 for .woff
wget https://fonts.googleapis.com/css?family=$URL_NAME:100,200,300,400,500,600,700,800,900 -O$
  sed "s/local('.*'), //" > $FILE

# get links dirname
URL=$(cat $FILE | tr '()' \\n | grep https\*:// | head -n 1)
DIRNAME=$(dirname $URL)

rm -rf $FONT_FOLDER
mkdir $FONT_FOLDER

# download all http links
cat $FILE | tr '()' \\n | grep https\*:// | parallel --gnu "wget {} -P $FONT_FOLDER"

# replace links to local
sed -e "s*"$DIRNAME"*\./web-font*" $FILE > $FILE".tmp" && mv $FILE".tmp" $FILE

chmod +x get-google-fonts.sh
./get-google-fonts "Open Sans"