System.getenv没有获取〜/.bash_profile中定义的变量 [英] System.getenv doesn't get variables defined in ~/.bash_profile

问题描述

这是〜/.bash_profile文件中的一行

export MESSAGE ="Hello World"

我想在Java中访问系统变量 MESSAGE .

System.getenv("MESSAGE"); 不起作用.

解决方案

.bash_profile文件仅作为登录shell的来源.如果您的Java进程是从不是登录shell的shell中产生的(例如，顶部带有#！/bin/sh 的脚本)，则它将不会读取它(尽管它仍然可以从环境中继承MESSAGE，具体取决于您的运行方式.

还请注意，对于不是登录" shell的交互式shell，也不会运行.bash_profile，因此即使有shell提示，也不能依靠它运行.人们通常使用.bashrc来实现该目的.

如果要在所有Bourne shell派生变量中设置变量，而不管它们是否是交互式的，请将其同时放在.profile和.bashrc中.

Here is a line in file ~/.bash_profile

export MESSAGE="Hello World"

I want to access system variable MESSAGE in java.

System.getenv("MESSAGE"); doesn't work.

解决方案

The .bash_profile file is only sourced for login shells. If your java process is spawned from a shell that is not a login shell (for example a script with a #!/bin/sh at the top) then it will not read it (though it may still inherit MESSAGE from the environment depending on how you run it).

Note also that .bash_profile is also not run for interactive shells that are not "login" shells, so you can't rely on it being run even when you have a shell prompt. People usually use .bashrc, which is sourced for all interactive shells, for that purpose.

If you want a variable to be set in all Bourne shell derivatives regardless of whether they are interactive or not, put it in both .profile and .bashrc.

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