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I reckon that's because mvn wants a single "-" for it's options. Try typing

mvn -version or mvn -v instead.

The error says "Unrecognised option: -", which I think indicates that it read the...

Just FYI.

Let's say you want to run C:\Program Files\MyApp\myapp.exe

To do so in a cmd prompt, enclose the path in quotes, "C:\Program Files\MyApp\myapp.exe"

If the program wants or accepts...