while true; do
	date -Iseconds >> onlinenet.log;
	curl -s -S -n http://ping.online.net/5Mo.dat -o /dev/null -w '%{time_total},%{size_download},%{speed_download}\n' >> onlinenet.log;
done


out

2020-02-18T23:48:02+08:00
80.313392,201559,2509.000
2020-02-18T23:49:22+08:00
317.781837,1504003,4732.000
2020-02-18T23:54:40+08:00
160.482972,972571,6060.000
2020-02-18T23:57:21+08:00