タイムアウトを２秒に設定する場合
command.sh
curl -m 2 -o output https://example.com
デフォルトは300秒（300000ミリ秒）です。
ソース：
#define DEFAULT_CONNECT_TIMEOUT 300000 /* milliseconds == five minutes */
https://github.com/curl/curl/blob/master/lib/connect.h
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