busctl:tldr:02b48

The command "busctl monitor ${service1 service2 ---}" is used to monitor D-Bus events and messages sent and received by certain services.

Here's a breakdown of the command syntax:

• "busctl" is a command-line utility for interacting with the D-Bus system message bus.

• "monitor" is an argument to the "busctl" command, specifying that we want to monitor events on the message bus.

• "${service1 service2 ---}" is a placeholder for the names of the services that you want to monitor. The "---" represents additional services that can be added.

When you run this command with specific service names, it will start monitoring the D-Bus events and messages related to those services. This can include messages being sent, received, and emitted by specific interfaces, objects, or methods provided by the services. The output of this command will show information about the monitored events, such as the sender and receiver of the messages, the D-Bus path, interfaces, and method calls or signals.