SSH
When the command completes successfully, it does not return any output but we can verify that the SSH service is running and listening on TCP port 22 by using the ss command and piping the output into grep to search the output for "sshd":
When the command completes successfully, it does not return any output but we can verify that the SSH service is running and listening on TCP port 22 by using the ss command and piping the output into grep to search the output for "sshd":