java - 当我从 java processbuilder 运行 bash 时，$PATH 是不同的

Question

当我运行包含“echo $Path”命令的 bach 脚本时，它在由 java 运行时输出的内容与从命令行运行时输出的内容不同。它还会影响我脚本的其他命令。为什么会发生这种情况以及如何避免？

以下是我运行 bashscript 的函数

public static String executeCommands(File tempScript, Boolean deleteFile)
        throws IOException, InterruptedException {

    StringBuffer output = new StringBuffer();

    try {
        ProcessBuilder pb = new ProcessBuilder("bash", tempScript.toString());
        pb.inheritIO();
        Process process = pb.start();
        process.waitFor();


        BufferedReader reader =
                new BufferedReader(new InputStreamReader(process.getInputStream()));

        String line = "";
        while ((line = reader.readLine()) != null) {
            output.append(line + "\n");
        }
        return line;

    } finally {
        if (deleteFile == true)
            tempScript.delete();
    }
}

当脚本在 bashscript 中包含“echo $PATH”时

输出为

/usr/bin:/bin:/usr/sbin:/sbin

但是当我从命令行运行时输出是

/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/scala/scala-2.11.8/bin:/Users/<user>/Installations/activator-dist-1.3.10

Answer 1

当我们从终端运行命令时，它会从 .bashrc 文件中读取环境变量，但 Eclipse 似乎不会从 .bashrc 中读取环境变量。

使用./eclipse -DPATH=$PATH启动eclipse以从bashrc读取

PATH 变量来自

1.终端

user@ubuntu:~$ javac SS47.java 
user@ubuntu:~$ java SS47 
/home/user/perl5/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/user/apache-maven-3.3.3/bin:/home/user/apache-maven-3.3.3/bin:/opt/jdk/jdk1.8.0_60/bin:/opt/jdk/jdk1.8.0_60/jre/bin:/home/user/dsc-cassandra-2.1.6/bin:/home/user/hadoop-2.6.0/bin:/home/user/hadoop-2.6.0/sbin:/home/user/android/android-studio/bin:/home/user/android/android-sdk-linux/platform-tools:/home/user/elasticsearch-2.3.5/bin:/home/user/scala-2.11.8/bin::/home/user/apache-maven-3.3.3/bin

2.eclipse 没有 $PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games

3.eclipse 与 PATH ./eclipse -DPATH=$PATH

/home/user/perl5/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/user/apache-maven-3.3.3/bin:/home/user/apache-maven-3.3.3/bin:/opt/jdk/jdk1.8.0_60/bin:/opt/jdk/jdk1.8.0_60/jre/bin:/home/user/dsc-cassandra-2.1.6/bin:/home/user/hadoop-2.6.0/bin:/home/user/hadoop-2.6.0/sbin:/home/user/android/android-studio/bin:/home/user/android/android-sdk-linux/platform-tools:/home/user/elasticsearch-2.3.5/bin:/home/user/scala-2.11.8/bin::/home/user/apache-maven-3.3.3/bin