This works, but only accidentally: curl --silent 'http://www.google.com/search?q=what+is+my+ip' | sed 's/.*Client IP address: //;s/).*//;q' Google respond

This works, but only accidentally: curl --silent 'http://www.google.com/search?q=what+is+my+ip' | sed 's/.*Client IP address: //;s/).*//;q' Google responds with HTTP error 403 (Forbidden), but it just so happens the client IP address is in the error page.