bash的出口不工作的只有一个变量 [英] bash export not working for only one variable

问题描述

有时候当我在bash出口它不给一个错误，但它并没有设置环境变量无论是。这就是我的意思是：

Occasionally when I export in bash it doesn't give an error but it doesn't set the environment variable either. Here's what I mean:

本作品：

bash-3.2$ export DYLD=$ABC_HOME
bash-3.2$ env | grep DYLD
DYLD=/Users/my_username/abc_home

但是，当我继续下去，这些不：

But when I continue, these don't:

bash-3.2$ export DYLD_LIBRARY=$ABC_HOME
bash-3.2$ env | grep DYLD
DYLD=/Users/my_username/abc_home

bash-3.2$ export DYLD_L=$ABC_HOME
bash-3.2$ env | grep DYLD
DYLD=/Users/my_username/abc_home

bash-3.2$ export DYLD_=$ABC_HOME
bash-3.2$ env | grep DYLD
DYLD=/Users/my_username/abc_home

任何想法，我可以看看如何解决这个问题？

Any idea what I could look at to fix this?

FWIW，按预期工作等用下划线出口，但这似乎开始失败一次，我在添加下划线。

FWIW, other exports with underscores work as expected, but this seems to start failing once I add the underscore in.

推荐答案

这似乎是一个OS X的保护（在埃尔卡皮坦增加可能）是$ P $被出口到生成的进程pvents这些（潜在的危险）的环境变量

This appears to be an OS X protection (added in El Capitan possibly) that prevents these (potentially dangerous) environment variables from being exported to spawned processes.

在苹果开发者论坛这个线程讨论这一些。

的官方文档<一个href=\"https://developer.apple.com/library/ios/documentation/Security/Conceptual/System_Integrity_Protection_Guide/RuntimeProtections/RuntimeProtections.html#//apple_ref/doc/uid/TP40016462-CH3-SW1\">here还对此进行简要：

The official documentation here also documents this briefly:

由系统完整性保护，限制处理产卵儿童进程，如通过启动辅助过程中捆绑与 NSTask 或调用 EXEC（ 2）命令，将重置子进程的马赫特殊端口。任何动态连接器（ dyld的）的环境变量，如 DYLD_LIBRARY_PATH ，正在启动保护程序时清除。

Spawning children processes of processes restricted by System Integrity Protection, such as by launching a helper process in a bundle with NSTask or calling the exec(2) command, resets the Mach special ports of that child process. Any dynamic linker (dyld) environment variables, such as DYLD_LIBRARY_PATH, are purged when launching protected processes.

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