import java.io.*;

public class ExecTest {
    public static void main(String[] args) {
        try {
            Runtime runtime = Runtime.getRuntime();
            Process process = runtime.exec("ls -a");

            /*標準出力を取得*/
            InputStream is = process.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));

            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);   //コマンドの結果を返す
            }

            process.waitFor();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
}