transfer a URL

-o, --output <file>
       Write  output  to <file> instead of stdout. If you are using {} or [] to fetch multiple documents,
       you can use '#' followed by a number in the <file> specifier. That variable will be replaced  with
       the current string for the URL being fetched. Like in:

         curl http://{one,two}.site.com -o "file_#1.txt"

       or use several variables like:

         curl http://{site,host}.host[1-5].com -o "#1_#2"

       You may use this option as many times as the number of URLs you have.