I'd like to do a health check of a service by calling a specific url on it. Feels like the simplest solution would be to use cron to do the check every minute or so. In case of errors, cron sends me an email. I tried using cUrl for this but I can't get it to output messages only on errors. If I try to direct output to /dev/null, it prints out progress report.  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current                                 Dload  Upload   Total   Spent    Left  Speed100  5559  100  5559    0     0   100k      0 --:--:-- --:--:-- --:--:--  106kI tried looking through the curl options but I just can't find anything to suit the situation where you want it to be silent on success but make noise on errors.Is there a way to make curl do what I want or is there some other tool I should be looking at?
Health check of web page using curl
bash;curl
What about -sSf? From the 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).For example:curl -sSf http://example.org > /dev/null