Ubuntu Netcat-如何获取连接时间？

我使用简单的代码来测试一些服务：

nc -v -w 2 google.com 80
Connection to google.com 80 port [tcp/http] succeeded!

它工作得很好，但我还需要一个连接时间。有可能通过netcat获得它吗？我在手册里找不到：（

这是你想要的吗

echo "[$(date)] Connection to $SERVER $PORT port [tcp/http] $(nc -z $SERVER $PORT &> /dev/null && echo succeeded || echo failed)"

例如：

$ echo "[$(date)] Connection to google.com 80 port [tcp/http] $(nc -z google.com 80 &> /dev/null && echo succeeded || echo failed)"
[Mon Apr 10 12:40:31 UTC 2017] Connection to google.com 80 port [tcp/http] succeeded

$ echo "[$(date)] Connection to google.com 80 port [tcp/http] $(nc -z google2.com 80 &> /dev/null && echo succeeded || echo failed)"
[Mon Apr 10 12:40:20 UTC 2017] Connection to google.com 80 port [tcp/http] failed

如果使用ncat（与nmap打包）而不是netcat，则可以获得如下连接定时信息：

ncat -v -z google.com 80

Ncat: Version 7.70 ( https://nmap.org/ncat )
Ncat: Connected to 172.217.15.78:80.
Ncat: 0 bytes sent, 0 bytes received in 0.35 seconds.

输出将如下所示：

ncat -v -z google.com 80

Ncat: Version 7.70 ( https://nmap.org/ncat )
Ncat: Connected to 172.217.15.78:80.
Ncat: 0 bytes sent, 0 bytes received in 0.35 seconds.

time nc-zw30
//例如：
$time nc-zw30 google.com 443
连接到google.com端口443[tcp/https]成功！
实际0.064s
用户0m0.003s
sys 0m0.006s

参考：