What are the functions of the netstat command in Ubuntu?

The “netstat” command in Ubuntu is used to display network status information, including network connections, routing tables, and interface statistics. Its main functions include:

1. Display network connection information: netstat can show the network connection information in the current system, including local address, remote address, connection status, and more.
2. Displaying routing table information: netstat can show the routing table information of the current system, including destination address, gateway, subnet mask, and so on.
3. Display interface statistics: netstat can show statistical information for each network interface in the system, including the number of packets and bytes sent and received.
4. Display process and port information: netstat can show the process ID and program name associated with each network connection, as well as information on the ports being listened on.
5. Netstat can display the transfer speeds of each network connection, including the receive and send rates of each connection.

In general, the netstat command can help users monitor network connections and traffic, diagnose network issues, and view the system’s network configuration information.