View online port detection threads

Run the following command to view the port usage in Centos, an online thread for port Detection: lsof-I tcp: 80 list all ports netstat-ntlp view all connections can be netstat-an query port 80 online connection thread netstat-n | grep tcp | grep 80 | wc-l query apache connection thread ps-ef | grep httpd | Total netstat-na connections whose wc-l query status is ESTABLISHED | grep ESTABLISHED | wc-l Query IP netstat-na with the most Connections | grep ESTABLISHED | awk '{print $5}' | awk-F: '{print $1}' | sort | uniq-c | sort-r