java如何调用shell

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class TestShell
{

    public static void main(String[] args) throws IOException
    {
        try
        {
            String commands = "echo $PATH >> 1.txt";
            Process process = Runtime.getRuntime().exec(new String[] { "sh", "-c", commands });

            // for showing the info on screen
            InputStreamReader ir = new InputStreamReader(process.getInputStream());
            BufferedReader input = new BufferedReader(ir);
            String line;
            while ((line = input.readLine()) != null)
            {

                System.out.println(line);
            }
        } catch (java.io.IOException e)
        {

            System.err.println("IOException " + e.getMessage());

        }
    }
}

参考 http://wangbaoaiboy.blog.163.com/blog/static/52111910201111892938552/

java使用Runtime.exec执行linux命令重定向或管道问题： http://my.oschina.net/hetiangui/blog/133981