busctl:tldr:94948

The command busctl tree ${service1 service2 ---} is not a valid command. It seems to be an incomplete example or an incorrect syntax.

In general, the busctl command is used to introspect and control the D-Bus bus daemon. D-Bus is a system for inter-process communication (IPC) and is commonly used on Linux systems to allow communication between different software components.

The busctl tree command is used to display a tree-like representation of the D-Bus object hierarchy. It shows the various bus names, their interfaces, objects, and their properties, methods, and signals.

However, the provided syntax ${service1 service2 ---} is not clear. It appears to be used to specify the services to include in the tree output, but the --- separator is not a valid delimiter.

To correctly use the busctl tree command, you need to provide the proper options and arguments. For example, to display the tree for a specific service, you can use the command busctl tree org.example.service. This will show the D-Bus object hierarchy for the org.example.service service.

If you provide more information or specify the desired behavior, I can provide a more accurate explanation or example of the command.