Question

我有一个在终端OSX上运行的命令：

cat File1 | ./huawei2text.pl > ~/File2.txt && cat ~/File2.txt| tr "," "\n"  > ~/Output.txt

如何仅使用java运行此命令？

我试过这段代码：

String whatToRun = "cat File1 | ./File.pl > ~/File2.txt && cat ~/File2.txt| tr "," "\n"  > ~/Output.txt";
   try
   {
     Runtime rt = Runtime.getRuntime();
     Process proc = rt.exec(whatToRun);
     int exitVal = proc.waitFor();
     System.out.println("Process exitValue:" + exitVal);
   } catch (Throwable t)
     {
       t.printStackTrace();
     }

更新

答案和解决方案：

String whatToRun = "cat File1 | ./File.pl > File2.txt "
            + "&& cat File2.txt| tr \",\" \"\n\"  > Output.txt";
String[] shellcmd = {"/bin/sh", "-c", whatToRun};

try {
    Runtime rt = Runtime.getRuntime();
    Process proc = rt.exec(shellcmd);
    int exitVal = proc.waitFor();
    System.out.println("Process exitValue:" + exitVal);
    }
catch (Throwable t) {
    t.printStackTrace();
}

现在它有效。谢谢！

Answer 1

管道将由 shell 解释。请求shell执行命令：

String[] shellcmd = {
  "/bin/sh",
  "-c",
  whatToRun
};

Process proc = rt.exec(shellcmd);

Answer 2

Java API允许您通过命名要运行的可执行文件来启动一个子进程。你在那里有一个完整的迷你脚本撞在一起。只有shell才能解释这些内容，所以你的字符串应该以

之类的东西开头

/bin/sh -c '... your command ...'

请注意单引号，它们很重要。

使用Java运行在Mac上使用终端管道的命令

2 个答案: