What is the linux view port command?

What is the Linux port command?

Linux view port command

The first one:

lsof -i:port number

Recommendation: "Linux Tutorial"

Second type:

netstat -nltp | grep port number

-a: Display all connections and listening ports of this machine

-n: In the form of network IP address, display the currently established effective connections and ports

-r: Display routing table information

-s: Display statistics by protocol

-v: Display currently valid connections

-t: Display all TCP protocol connections

-u : Display all UDP protocol connection status

-i: Display the status of the automatically configured port

-l: Only display the service network status with the connection status listening

-p: Display pid/program name

Several statuses of TCP connection

ESTABLISHED    已建立
CLOSED   已关闭
LISTENING  正在监听
FIN-WAIT-2   等待连接关闭
TIME-WAIT   等待足够时间，确保服务器正常关闭该连接

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