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As long as you identify a command line window as a process, you could specify whatever commands (including newman) you want written via the keys method.
IE: In python
p = Sys.Process("MyApp");
w = p.Window("ConsoleWindowClass", "*");
w.Keys("MyString [Enter]");
https://support.smartbear.com/testcomplete/docs/app-testing/desktop/console/interacting-with.html