Linux netstat useful commands

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• Common commands for port and statistics in Linux

Common commands for port and statistics in Linux

Common commands for port and statistics in Linux
--- Count the number of connections on port 80
Netstat-Nat | grep-I "80" | WC-l

--- Summary of network connection status of the current system
Netstat-N | awk '/^ TCP/{++ State [$ NF]} end {for (key in State) print key, "\ t ", state [Key]}'

--- Count the number of connections on port 80 and sort them in ascending order
Netstat-Na | grep: 80 | awk '{print $5}' | awk-F: '{print $1}' | sort | uniq-c | sort-r-N | head-50

--- List the Top n ip addresses with the highest number of connections and the number of connections
Netstat-an | grep: 80 | awk '{print $5}' | awk-F: '{print $1}' | uniq-c | sort-r | head-100

--- PHP-CGI usage