What is the command to start the SSH service on Linux?

In most Linux distributions, the command to start the SSH service is either sudo service ssh start or sudo systemctl start ssh.

When you use the command ‘sudo service ssh start’ to start the SSH service, the system will attempt to start the OpenSSH server. If the OpenSSH package is properly installed and the configuration file settings are correct, the SSH service will start and begin listening for connection requests from other computers.

This will allow you to remotely connect to your Linux system via an SSH client. By default, the SSH service listens on port 22 and uses secure encryption protocols for communication.

If you have multiple versions of SSH services on your system (such as OpenSSH and Dropbear), you can use the following command to explicitly start the OpenSSH service:

sudo service openssh-server start

For Linux distributions that use systemd as the system initialization manager, such as Ubuntu 16.04+, Debian 8+, CentOS 7+, etc., you can use the following command to start the SSH service:

sudo systemctl start sshd

Regardless of the method used, the SSH service will start running and be ready to accept connection requests from other computers. You can make a remote connection by using an SSH client tool (such as OpenSSH, PuTTY, etc.) and specifying the IP address or hostname of your Linux system, along with the corresponding user credentials.