# 5. 输出彩色的内容

## 格式

echo -e "\033\[n1;n2;n3m字符串\033\[关闭属性"

* n1,n2,n3:为任意组合的数字
* 字体颜色范围:30-37
  * 30:黑色
  * 31:红色
  * 32:绿色
  * 33:黄色
  * 34:蓝色
  * 35:紫色
  * 36:天蓝色
  * 37:白色
* 背景色范围:40-47
  * 40:黑底
  * 41:红底
  * 42:绿底
  * 43:黄底
  * 44:蓝底
  * 45:紫底
  * 46:天蓝色低
  * 47:白底
* 特效范围:0,1,4,5
  * 0:无任何特效
  * 1:高亮(加粗)
  * 4:下划线
  * 5:闪烁

## 简单示例

```bash
# 红色字体
echo -e "\033[31m啦啦啦 \033[0m"

# 白底红字
echo -e "\033[47;31m白底红字内容 \033[0m"

# 白底红字下划线
echo -e "\033[4;31;47m测试内容 \033[0m"

# 下划线
echo -e "\033[4m下划线内容 \033[0m"
```

## 综合示例

模拟系统登入(带色),蓝底黄字输入用户名

```
read -p "`echo -e "\033[44;33m用户名: \033[0m"`"  username
read -p "密码:" -s password
echo "你输入的用户名$username"
echo "你输入的密码:$password"
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://sugar-at.gitbook.io/blog-article/shell/5.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.