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How to run simple windows commands through java program?

 
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I have to create a simple shell that takes inputs such as "ls" which lists all files in the current directory and "run cmd" which runs the program cmd.exe. I don�t know how to do this.
I have to use System.in and System.out methods to accomplish this.
I copied the cmd.exe to my root and tried this code:

But nothing happent.
 
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Try this.

 
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This article spells out some pitfalls to avoid when using Runtime.exec.
 
Don't get me started about those stupid light bulbs.
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