Que tal -sSf
? Das man pages:
-s/--silent Silent or quiet mode. Do not show progress meter or error messages. Makes Curl mute. -S/--show-error When used with -s it makes curl show an error message if it fails. -f/--fail (HTTP) Fail silently (no output at all) on server errors. This is mostly done to better enable scripts etc to better deal with failed attempts. In normal cases when a HTTP server fails to deliver a document, it returns an HTML document stating so (which often also describes why and more). This flag will prevent curl from outputting that and return error 22. This method is not fail-safe and there are occasions where non-successful response codes will slip through, especially when authentication is involved (response codes 401 and 407).
Por exemplo:
curl -sSf http://example.org > /dev/null