java - 进程构建器参数

Question

final String commands[] =  {"arp", "-n", "|" ,"grep", "98:5d:ad:3d:36:ef", "|", "awk '", "{print $1}", "'"};
ProcessBuilder pb = new ProcessBuilder(commands); 

我想根据 MA​​C 地址检索 IP。
当我将此命令插入终端(ubuntu 16.04)时，它起作用了。
但是我在JAVA中使用的时候就不行了。

我做错了什么？

只有当我像这样运行它时才有效:

final String commands[] =  {"arp", "-n"};
ProcessBuilder pb = new ProcessBuilder(commands); 

Answer 1

您需要调用“sh”并将管道命令传递给该程序。尝试:

ProcessBuilder b = new ProcessBuilder( "/bin/sh", "-c",
               "arp -n | grep 98:5d:ad:3d:36:ef | awk '{print $1}'" );