chkconfig:tldr:8bb55

The command you provided is "chkconfig ${ntpd} off".

This command is typically used in Unix-like operating systems, such as Linux, to manage and configure the startup services.

Here's a breakdown of the command:

• "chkconfig" is the actual command that allows users to manage and configure various services' startup states.
• "${ntpd}" is a placeholder for the name of the service. The "${}" syntax suggests that "ntpd" is a variable holding a value. So, the actual service name should be substituted in place of "${ntpd}" in the real command.
• "off" is an argument specifying the desired state or action for the service. In this case, "off" means the service should not start automatically during system boot.

So, this command instructs the "chkconfig" tool to turn off the specified service, preventing it from starting automatically upon system startup.