コマンドを実行

import java.io.*;

public class Test {
	public static void main(String args[]) throws IOException
	{
		String line;
		Process process = Runtime.getRuntime().exec("ls -l");
		InputStream i_s = process.getInputStream();
		BufferedReader in = new BufferedReader(new InputStreamReader(i_s));
		PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("temp.txt")));

		while ((line = in.readLine()) != null)
			out.println(line);
		in.close();
		out.close();

		process = Runtime.getRuntime().exec("cat temp.txt");
		i_s = process.getInputStream();
		in = new BufferedReader(new InputStreamReader(i_s));

		while ((line = in.readLine()) != null)
			System.out.println(line);
		in.close();
	}
}