Linux 如何删除导出的环境变量？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6877727/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I delete an exported environment variable?
提问by A. K.
Before installing gnuplot, I set the environment variable GNUPLOT_DRIVER_DIR = /home/gnuplot/build/src. During the installation, something went wrong.
在安装 gnuplot 之前，我设置了环境变量GNUPLOT_DRIVER_DIR = /home/gnuplot/build/src. 在安装过程中，出了点问题。
I want to remove the GNUPLOT_DRIVER_DIRenvironment variable. How can I achieve it?
我想删除GNUPLOT_DRIVER_DIR环境变量。我怎样才能实现它？
采纳答案by Peder Klingenberg
unsetis the command you're looking for.
unset是您要查找的命令。
unset GNUPLOT_DRIVER_DIR
回答by Eric Leschinski
Walkthrough of creating and deleting an environment variable in bash:
在 bash 中创建和删除环境变量的演练：
Test if the DUALCASE variable exists:
测试 DUALCASE 变量是否存在：
el@apollo:~$ env | grep DUALCASE
el@apollo:~$
It does not, so create the variable and export it:
它没有，因此创建变量并将其导出：
el@apollo:~$ DUALCASE=1
el@apollo:~$ export DUALCASE
Check if it is there:
检查它是否存在：
el@apollo:~$ env | grep DUALCASE
DUALCASE=1
It is there. So get rid of it:
它在那里。所以摆脱它：
el@apollo:~$ unset DUALCASE
Check if it's still there:
检查它是否仍然存在：
el@apollo:~$ env | grep DUALCASE
el@apollo:~$
The DUALCASE exported environment variable is deleted.
DUALCASE 导出的环境变量被删除。
Extra commands to help clear your local and environment variables:
帮助清除本地和环境变量的额外命令：
Unset all local variables back to default on login:
在登录时将所有局部变量取消设置回默认值：
el@apollo:~$ CAN="chuck norris"
el@apollo:~$ set | grep CAN
CAN='chuck norris'
el@apollo:~$ env | grep CAN
el@apollo:~$
el@apollo:~$ exec bash
el@apollo:~$ set | grep CAN
el@apollo:~$ env | grep CAN
el@apollo:~$
exec bashcommand cleared all the local variables but not environment variables.
exec bash命令清除所有局部变量，但不清除环境变量。
Unset all environment variables back to default on login:
在登录时将所有环境变量取消设置回默认值：
el@apollo:~$ export DOGE="so wow"
el@apollo:~$ env | grep DOGE
DOGE=so wow
el@apollo:~$ env -i bash
el@apollo:~$ env | grep DOGE
el@apollo:~$
env -i bashcommand cleared all the environment variables to default on login.
env -i bash命令在登录时将所有环境变量清除为默认值。
回答by Nilesh K.
this may also work.
这也可能有效。
export GNUPLOT_DRIVER_DIR=
回答by G Eitan
Because the original question doesn't mention how the variable was set, and because I got to this page looking for this specific answer, I'm adding the following:
因为最初的问题没有提到变量是如何设置的，而且因为我到这个页面寻找这个特定的答案，所以我添加了以下内容：
In C shell (csh/tcsh)there are two ways to set an environment variable:
在 C shell (csh/tcsh) 中有两种设置环境变量的方法：
set x = "something"setenv x "something"
set x = "something"setenv x "something"
The difference in the behaviour is that variables set with setenvcommand are automatically exported to subshell while variable set with setaren't.
行为的不同之处在于，使用setenv命令设置的变量会自动导出到子 shell，而使用set 设置的变量则不会。
To unset a variable set with set, use
要使用set取消设置变量集，请使用
unset x
To unset a variable set with setenv, use
要使用setenv取消设置变量，请使用
unsetenv x
Note:in all the above, I assume that the variable name is 'x'.
注意：在以上所有内容中，我假设变量名称是“x”。
credits:
学分：
https://www.cyberciti.biz/faq/unix-linux-difference-between-set-and-setenv-c-shell-variable/https://www.oreilly.com/library/view/solaristm-7-reference/0130200484/0130200484_ch18lev1sec24.html
https://www.cyberciti.biz/faq/unix-linux-difference-between-set-and-setenv-c-shell-variable/ https://www.oreilly.com/library/view/solarism-7-参考/0130200484/0130200484_ch18lev1sec24.html
回答by Rishabh Bohra
As mentioned in the above answers, unset GNUPLOT_DRIVER_DIRshould work if you have used exportto set the variable. If you have set it permanently in ~/.bashrcor ~/.zshrcthen simply removing it from there will work.
正如上面的答案中提到的，unset GNUPLOT_DRIVER_DIR如果您曾经export设置过变量，应该可以使用。如果您已将其永久设置，~/.bashrc或者~/.zshrc只需将其从那里移除即可。
