man curl:
-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.
See also the --create-dirs option to create the local directories
dynamically. Specifying the output as '-' (a single dash) will force
the output to be done to stdout.