Netcat - 如何獲得連接時間？

Question

我用簡單的代碼來測試一些服務：

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

它工作得很好，但我也需要有一個連接時間。是否有可能通過netcat獲取它？我不能手動:(

Answer 1

在發現這是這一點，你想要什麼

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