How do you check the opened ports in Linux?

You can use the following command in Linux to view the open ports:

1. “Netstat is a command-line tool used to display network connections and statistics.”

netstat -tunl

This command will display all TCP and UDP connections, as well as the listening ports.

1. I only need one option.

ss -tunl

This command can also display the current TCP and UDP connections and listening ports, similar to netstat, but the performance of the ss command is better.

1. List open files

lsof -i

This command can list all open files, including network connections and listening ports.

All of the above commands require root permissions to execute. If you do not have root permissions, you can use the sudo command to execute them.