使用curl可以下載網絡內容，那如何獲取curl下載時的下載速度呢，使用下面的命令即可：
# curl -Lo /dev/null -skw "%{speed_download}\n" http://mirrors.163.com/ubuntu/ls-lR.gz 226493.000
當然，還可以獲取連接時間、重定向時間等更多的數據：
# curl -Lo /dev/null -skw "time_connect: %{time_connect} s\ntime_namelookup: %{time_namelookup} s\ntime_pretransfer: %{time_pretransfer} s\ntime_starttransfer: %{time_starttransfer} s\ntime_redirect: %{time_redirect} s\nspeed_download: %{speed_download} B/s\ntime_total: %{time_total} s\n\n" http://www.sina.com time_connect: 0.154 s time_namelookup: 0.150 s time_pretransfer: 0.154 s time_starttransfer: 0.163 s time_redirect: 0.157 s speed_download: 324679.000 B/s time_total: 1.692 s