sshd Linux command

The sshd command in Linux is used to start, stop, or restart the SSH daemon. This command allows you to manage the configuration of the SSH server, such as specifying the port number, host key file, and more. By using the sshd command, you can easily control the behavior of the SSH server on your Linux system.

sshd Syntax:

sshd [options]

Options:

Option	Description
-D	Do not detach and run in foreground
-d	Debug mode
-e	Log to standard error instead of syslog
-f file	Use specified configuration file
-h	Display usage message
-i	Disable login grace time
-p port	Port to listen for connections on
-q	Quiet mode
-v	Verbose mode
-V	Display version number

Parameters:

Parameter	Description
address	Specify the address to bind to
port	Specify the port to listen for connections on
config	Specify the configuration file to use
keygen	Generate a new host key as part of a host key setup

Caution

It’s important to be cautious when using the sshd command, as it controls the SSH server on the system. Improper configurations or misuse can lead to security vulnerabilities or unauthorized access to your system.

sshd bash Examples:

Start the SSH server

sudo service ssh start

This command starts the SSH server on a Linux system.

Stop the SSH server

sudo service ssh stop

This command stops the SSH server on a Linux system.

Restart the SSH server

sudo service ssh restart

This command restarts the SSH server on a Linux system.

Check the status of the SSH server

sudo service ssh status

This command checks the status of the SSH server on a Linux system.

Enable the SSH service to start on boot

sudo systemctl enable ssh

This command configures the SSH service to start automatically on system boot.

Disable the SSH service from starting on boot

sudo systemctl disable ssh

This command prevents the SSH service from starting automatically on system boot.

Tip

When using the sshd command in Linux, make sure to carefully review and configure the server’s SSH settings to ensure secure remote connections. Regularly check for updates and security patches to keep your system protected against potential vulnerabilities.

sshd Command Help Center:

How do I use sshd in Linux?

To use the sshd command in Linux, execute the following command:

sshd --option <value>

How can I start the sshd service in Linux?

To start the sshd service in Linux, use the following command:

sudo service ssh start

How do I check the status of sshd in Linux?

To check the status of the sshd service in Linux, run the following command:

systemctl status sshd

How can I stop the sshd service in Linux?

To stop the sshd service in Linux, execute the following command:

sudo service ssh stop

How do I restart sshd in Linux?

To restart the sshd service in Linux, use the following command:

sudo service ssh restart

How do I reload the sshd configuration in Linux?

To reload the sshd configuration in Linux without disconnecting active connections, use the following command:

sudo service ssh reload

How can I enable sshd to start on system boot in Linux?

To enable the sshd service to start on system boot in Linux, run the following command:

sudo systemctl enable ssh

How do I disable SSH password authentication in sshd configuration?

To disable SSH password authentication in the sshd configuration, follow these steps:

sudo nano /etc/ssh/sshd_config

Edit the file to set PasswordAuthentication no, then save and exit. Finally, restart the sshd service.

Applications of the sshd command

• Start the SSH daemon service
• Monitor and manage incoming SSH connections
• Permit or deny specific users or IP addresses from connecting via SSH