在java中执行linux终端命令？ [英] Execute a linux terminal command in java?

问题描述

我正在尝试从java执行SOX命令，但不幸的是它每次都返回一个错误。其他每个SOX命令都运行得很好!!
以下是代码：

i'm trying to execute a SOX command from java, but unfortunately its returning an error everytime. Every other SOX commands are working perfectly though!! Here is the code :

class Simple {
    public static void main(String args[]) throws IOException, Exception {
        Process p;
        BufferedReader br;
        String co = "sox speech_16.wav -p pad 0 2.5 | sox - -m speech_16.wav speech_output.wav";
        p = Runtime.getRuntime().exec(co);
        br = new BufferedReader(new InputStreamReader(p.getInputStream()));
            int returnCode = p.waitFor();
        System.out.println("reurn code : "+returnCode);         
    }
}

当我在终端中执行相同的sox命令时，它的工作正常。我真的无法理解问题是什么！是因为'|'符号？

When I'm executing the same sox command in terminal, its working fine. I really can't understand what the problem is!! Is it because of the '|' symbol??

推荐答案

问题是Runtime.exec（）不理解shell概念，例如|。而是尝试：

The issue is that Runtime.exec() does not understand shell concepts such as "|". Instead try:

Runtime.getRuntime().exec("/bin/sh", "-c", co);

问题是exec直接运行二进制文件而不调用shell。 |字符只能由shell识别，而不是由sox识别。 -c告诉shell运行单个命令，并将整个命令作为单个参数传递。

The problem is that exec runs a binary directly without invoking the shell. The "|" character is only recognized by the shell, not by sox. The "-c" tells the shell to run a single command, and passes the entire command as the single argument.

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