To start, stop, or restart the Secure Shell (SSH) daemon (sshd) on a CentOS system, you can use the systemctl command, which is a utility for controlling system services.
To start the sshd service, use the following command:
sudo systemctl start sshd
To stop the sshd service, use the following command:
sudo systemctl stop sshd
To restart the sshd service, use the following command:
sudo systemctl restart sshd
Note that you will need to use sudo to execute these commands, as they require root privileges.
You can also check the status of the sshd service using the systemctl command:
sudo systemctl status sshd
This will display the current status of the sshd service, including whether it is running or stopped.