From 7655bd6a60f5e0c0c0c8968b177e74536e1b380c Mon Sep 17 00:00:00 2001
From: leafee98 <leafee98@hotmail.com>
Date: Thu, 17 Nov 2022 16:38:21 +0800
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---
 .../为单一命令设置代理环境变量的终端函数.md      | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/content/posts/为单一命令设置代理环境变量的终端函数.md b/content/posts/为单一命令设置代理环境变量的终端函数.md
index c90546d..a2bea75 100644
--- a/content/posts/为单一命令设置代理环境变量的终端函数.md
+++ b/content/posts/为单一命令设置代理环境变量的终端函数.md
@@ -1,6 +1,7 @@
 ---
 title: "为单一命令设置环境变量的终端函数"
 date: 2021-04-19T14:10:41+08:00
+lastmod: 2022-11-17T16:36:00+08:00
 tags: [ linux, shell, bash ]
 categories: [ tech ]
 weight: 50
@@ -37,6 +38,20 @@ function proxyenv {
 }
 ```
 
+### 针对 sudo 命令
+
+在使用 `sudo` 命令时，它的默认行为是不保留任何当前 shell 下的环境变量，因此即便使用 `proxyenv sudo wget` 命令，也无法在 `wget` 中使用这些环境变量。一个临时的解决方案是使用 `sudo` 的 `--preserve-env` 参数，像下面这样
+
+```
+$ proxyenv sudo -E wget http://example.org
+```
+
+如果希望简化每次需要敲的命令，可以在 `/etc/sudoer` 中添加以下内容，如此便可以每次默认保留这几个环境变量，`proxyenv sudo wget` 也会保留这些环境变量。
+
+```
+Defaults env_keep += "PROXY HTTP_PROXY HTTPS_PROXY proxy http_proxy https_proxy"
+```
+
 ### 分析
 
 使用圆括号创建 subshell 来隔离原来的变量环境, 在内部创建变量或 export 不会影响外部 shell 的变量.
@@ -95,3 +110,4 @@ hello shell
 1. [What is the best way to write a wrapper function that runs commands and logs their exit code](https://stackoverflow.com/questions/372116/what-is-the-best-way-to-write-a-wrapper-function-that-runs-commands-and-logs-the/372120#372120)
 2. [Bash script - variable content as a command to run](https://stackoverflow.com/questions/5998066/bash-script-variable-content-as-a-command-to-run/39458935#39458935)
 3. [Do parentheses really put the command in a subshell?](https://unix.stackexchange.com/questions/138463/do-parentheses-really-put-the-command-in-a-subshell/138498#138498)
+4. [sudoer(5) - Linux manual page](https://man7.org/linux/man-pages/man5/sudoers.5.html)