Problem Using Java execute shell script with piped symbol command or redirect the output

果然多試幾個指令後，發現之前的用法，雖然沒什麼問題，但是遇到指令有帶 | 或是重新導向的語法時，問題就顯示出來，需改用下面的方式就解決了。
import java.io.*; import java.net.*; import java.util.*; public class runshell { public static void main(String a[]) throws Exception { List cmds = new ArrayList(); cmds.add("sh"); cmds.add("-c"); cmds.add("ps -ef | grep -v grep"); ProcessBuilder pb =new ProcessBuilder(cmds); Process pl = pb.start(); String line = ""; BufferedReader p_in = new BufferedReader(new InputStreamReader(pl.getInputStream())); while ((line = p_in.readLine()) != null) { System.out.println(line); } p_in.close(); } }