[Linux][自分用メモ] curlの進捗を非表示にする方法。

-s, --silent
Silent or quiet mode. Don't show progress meter or error messages.  Makes Curl mute.
It  will  still output the data you ask for, potentially even to the terminal/stdout
unless you redirect it.

-S, --show-error
When used with -s it makes curl show an error message if it fails.