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 Runtime.getRuntime().exec(command)
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 Runtime.getRuntime().exec("ls");
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public static void main(String[] agrs){
try
{
 Process process = Runtime.getRuntime().exec ("ls"); 
 InputStreamReader ir=newInputStreamReader(process.getInputStream());
 LineNumberReader input = new LineNumberReader (ir);
 String line;
 while ((line = input.readLine ()) != null){
  System.out.println(line)
}
}catch (java.io.IOException e){
 System.err.println ("IOException " + e.getMessage());
}
}