如何列出包括 LD_LIBRARY_PATH 在内的所有 Linux 环境变量
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How to list all Linux environment variables including LD_LIBRARY_PATH
提问by Michael harris
How to list all the environment variables in Linux?
如何列出Linux中的所有环境变量？
When I type the command envor printenvit gives me lots of variables, but some variables like LD_LIBRARY_PATHand PKG_CONFIGdon't show up in this list.
当我输入命令时env，printenv它会给我很多变量，但有些变量喜欢LD_LIBRARY_PATH和PKG_CONFIG没有出现在这个列表中。
I want to type a command that list all the environment variables including this variables (LD_LIBRARY_PATHand PKG_CONFIG)
我想输入一个命令，列出所有环境变量，包括这个变量（LD_LIBRARY_PATH和PKG_CONFIG）
采纳答案by Maxim Egorushkin
envdoes list all environment variables.
env确实列出了所有环境变量。
If LD_LIBRARY_PATHis not there, then that variable was not declared; or was declared but not exported, so that child processes do not inherit it.
如果LD_LIBRARY_PATH不存在，则未声明该变量；或已声明但未exported，因此子进程不会继承它。
If you are setting LD_LIBRARY_PATHin your shell start-up files, like .bash_profileor .bashrcmake sure it is exported:
如果你LD_LIBRARY_PATH在你的 shell 启动文件中设置，像.bash_profile或.bashrc确保它被导出：
export LD_LIBRARY_PATH
回答by sager89
try
尝试
export LD_LIBRARY_PATH=/usr/local/lib:${LD_LIBRARY_PATH}
This will modify the variable.
这将修改变量。
To print it, type: echo $LD_LIBRARY_PATHand it should show the above value.
要打印它，请键入：echo $LD_LIBRARY_PATH它应该显示上述值。
If you're seeing nothing when you print that, then the variable might not be set.
如果您在打印时什么也没看到，则可能未设置该变量。
回答by BMW
The question in fact is a good question. when run envor printenv, the output will be the system environment, but LD_LIBRARY_PATH is not belong to.
这个问题其实是个好问题。运行env或 时printenv，输出将是系统环境，但 LD_LIBRARY_PATH 不属于。
For example, if you set a=1, you can't show it by env. Same as LD_LIBRARY_PATH, it is used by ld.so only(ld. so – this little program that starts all your applications)
例如，如果您设置了a=1，则无法通过 显示它env。与 LD_LIBRARY_PATH 相同，它仅由 ld.so 使用（ld.so - 这个启动所有应用程序的小程序）
