# Unix Shell 基本觀念
## /
---
# 全域變數
## 動態變數
```
/home/olivertzeng == /home/$USER == $HOME
```
---
# $PATH
* 執行檔
* `export PATH="/foo/bar/baz/bin:$PATH"`
---
# alias
* 定義
* alias vim = "vim -y"
---
# Unix 權限管理
* sudo
* wheel
* chmod
* chown
* visudo
{"title":"Markdown","contributors":"[{\"id\":\"9e1c57c7-1250-47f2-8513-e5a1a7ebef6a\",\"add\":459,\"del\":204}]","description":"# 標題"}