Simple ROOT Calls

Need to do this,
````
read df.root file
```

The in my terminal should read a ROOT file and be ready for execution...

Start by inspecting the terminal command entry point and command-parsing code to determine how a request to read a ROOT file would fit. The issue names no files or tests, so first clarify the intended command syntax, ROOT-file behavior, and what execution-ready means; done should be demonstrated by a documented working example and tests where the project supports them.

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