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const md = `## Shell echo 命令\n\`echo\` 是一个内置的 Shell 命令，用于在标准输出（通常是终端）显示一行文本或变量的值。\nShell 的 echo 指令与 PHP 的 echo 指令类似，都是用于字符串的输出。\n\n\n\n**命令格式：**\n\n\n\n\`\`\`\n\necho [选项] [字符串]\n\n\`\`\`\n\n\n### 为什么需要 echo？\n\n\n\n\n- **信息反馈**：向用户显示脚本执行状态或结果\n\n- **调试工具**：输出变量值或执行位置，帮助调试脚本\n\n- **交互界面**：创建简单的用户交互界面\n\n- **文件生成**：快速生成配置文件或脚本\n\n\n\n\n---\n\n基本用法\n\n\n### 1. 简单文本输出\n\n最基本的用法是直接输出字符串：\n\n\n\n\n\n## 实例\n\n\necho "Hello, World!"\n\n\n\n\n**执行结果**：\n\n\n\n\`\`\`\nHello, World!\n\n\`\`\`\n\n\n### 2. 输出变量\n\n\`echo\` 可以显示变量的值：\n\n\n\n\n\n## 实例\n\n\nname="Linux User"\n\necho "Welcome, $name!"\n\n\n\n\n**执行结果**：\n\n\n\n\`\`\`\nWelcome, Linux User!\n\n\`\`\`\n\n\n### 3. 不带引号的输出\n\n引号不是必须的，但建议使用以避免意外：\n\n\n\n\n\n## 实例\n\n\necho This is a test\n\n\n\n\n**执行结果**：\n\n\n\n\`\`\`\nThis is a test\n\n\`\`\`\n\n\n---\n\n\n## 常用选项\n\n\n### -n 选项：不换行输出\n\n默认情况下，\`echo\` 会在输出后添加换行符。使用 \`-n\` 可以禁止这种行为：\n\n\n\n\n\n## 实例\n\n\necho -n "Loading..."\n\necho " Done!"\n\n\n\n\n**执行结果**：\n\n\n\n\`\`\`\nLoading... Done!\n\n\`\`\`\n\n\n### -e 选项：启用转义字符解释\n\n启用对反斜杠转义的解释：\n\n\n\n\n\n## 实例\n\n\necho -e "First line\\nSecond line"\n\n\n\n\n**执行结果**：\n\n\n\n\`\`\`\nFirst line\nSecond line\n\n\`\`\`\n\n\n### 常用转义序列\n\n\n\n\n转义序列\n说明\n\n\n\n\`\\n\`\n换行\n\n\n\`\\t\`\n水平制表符\n\n\n\`\\v\`\n垂直制表符\n\n\n\`\\b\`\n退格\n\n\n\`\\r\`\n回车\n\n\n\`\\\\\`\n反斜杠字符本身\n\n\n\n---\n\n\n## 高级用法\n\n\n### 1. 输出到文件\n\n使用重定向将输出保存到文件：\n\n\n\n\n\n## 实例\n\n\necho "This will be saved to file" > output.txt\n\n\n\n\n追加内容到文件：\n\n\n\n\n\n## 实例\n\n\necho "Additional line" >> output.txt\n\n\n\n\n\n### 2. 彩色输出\n\n使用 ANSI 转义码实现彩色文本：\n\n\n\n\n\n## 实例\n\n\necho -e "\\033[31mRed Text\\033[0m"\n\necho -e "\\033[42;31mGreen Background with Red Text\\033[0m"\n\n\n\n\n**颜色代码参考**：\n\n\n\n\n\n- 前景色：30(黑)、31(红)、32(绿)、33(黄)、34(蓝)、35(紫)、36(青)、37(白)\n\n- 背景色：40-47 对应上述颜色\n\n- \`\\033[0m\` 重置所有属性\n\n\n\n### 3. 输出命令执行结果\n\n使用命令替换输出命令结果：\n\n\n\n\n\n## 实例\n\n\necho "Today is $(date)"\n\n\n\n\n**执行结果**：\n\n\n\n\`\`\`\nToday is Wed Jul 12 14:30:22 CST 2023\n\n\`\`\`\n\n\n---\n\n\n## 实际应用示例\n\n\n### 1. 创建简单菜单\n\n\n\n\n## 实例\n\n\necho -e "\\n\\033[1mSystem Menu\\033[0m"\n\necho "1. Check disk space"\n\necho "2. List running processes"\n\necho "3. Show system info"\n\necho -n "Please enter your choice [1-3]: "\n\n\n\n\n\n### 2. 进度条模拟\n\n\n\n\n## 实例\n\n\necho -n "Progress: ["\n\nfor i in {1..20}; do\n\n echo -n "#"\n\n sleep 0.1\n\ndone\n\necho "] Done!"\n\n\n\n\n\n### 3. 生成配置文件\n\n\n\n\n## 实例\n\n\ncat EOF | sudo tee /etc/myapp.conf\n\n# Generated by script on $(date)\n\n[Database]\n\nhost = localhost\n\nport = 3306\n\nuser = appuser\n\npassword = secret123\n\nEOF\n\n\n\n\n\n---\n\n\n## 注意事项\n\n**1、引号的重要性**：\n\n\n\n\n\n## 实例\n\n\nvar="Hello World"\n\necho $var # 可能有问题，如果变量包含空格\n\necho "$var" # 正确方式\n\n\n\n\n**2、不同Shell的实现差异**：\n\n\n\n\n\n- Bash 内置 \`echo\` 支持 \`-e\` 选项\n\n- 某些系统上的 \`/bin/echo\` 可能不支持所有选项\n\n- 可移植脚本建议使用 \`printf\` 替代复杂 \`echo\`\n\n\n**3、特殊字符处理**：\n\n\n\n\n\n## 实例\n\n\necho "Cost: \\$100" # 输出 $ 符号\n\necho "Path: /usr/local/bin" # 斜杠不需要转义\n\n\n\n\n\n\n---\n\n\n## 总结要点\n\n\n\n\n关键点\n说明\n\n\n\n基本语法\n\`echo [选项] [字符串]\`\n\n\n常用选项\n\`-n\` 不换行，\`-e\` 启用转义\n\n\n变量输出\n使用 \`$变量名\`，建议用双引号包裹\n\n\n彩色输出\n使用 ANSI 转义码 \`\\033[XXm\`\n\n\n输出重定向\n\`>\` 覆盖文件，\`>>\` 追加到文件\n\n\n多行输出\n使用 \`\\n\` 换行或 Here Document\n\n\n可移植性建议\n复杂输出考虑使用 \`printf\`\n\n\n \n \n \n \n \n\n \n \n [ Shell test 命令](http://www.runoob.com/linux/linux-shell-test.html)\n \n\n \n \n \n \n \n\n\n\n\n\n \n## \n \n \n \n 3 篇笔记\n 写笔记\n\n\n\n\n\n \n\n #0 leocll\n\n leo***@qq.com\n\n 92echo输出的字符串总结\n\n===================================================================\n\n 能否引用变量 | 能否引用转移符 | 能否引用文本格式符(如：换行符、制表符)\n\n单引号 | 否 | 否 | 否\n\n双引号 | 能 | 能 | 能\n\n无引号 | 能 | 能 | 否 \n\n===================================================================\n\n[leocll](https://www.runoob.comjavascript:;) leocll\n\n leo***@qq.com\n\n9年前 (2017-09-28)\n#0 muzhiming\n\n muz***ing_zbq@163.com\n\n 121read 命令一个一个词组地接收输入的参数，每个词组需要使用空格进行分隔；如果输入的词组个数大于需要的参数个数，则多出的词组将被作为整体为最后一个参数接收。\n\n\n\n测试文件 test.sh 代码如下：\n\n\n\n\`\`\`\nread firstStr secondStr\necho "第一个参数:$firstStr; 第二个参数:$secondStr"\n\`\`\`\n\n执行测试：\n\n\n\n\`\`\`\n\n$ sh test.sh \n一 二 三 四\n第一个参数:一; 第二个参数:二 三 四\n\n\`\`\`\n\n\n实例, 文件 test.sh:\n\n\n\n\n\n\`\`\`\nread -p "请输入一段文字:" -n 6 -t 5 -s password\necho -e "\\npassword is $password"\n\`\`\`\n\n\n\n参数说明：\n\n- \n**-p** 输入提示文字\n\n- \n**-n** 输入字符长度限制(达到6位，自动结束)\n\n- \n**-t** 输入限时 \n\n- \n**-s** 隐藏输入内容\n\n\n\n\n\`\`\`\n$ sh test.sh \n请输入一段文字:\npassword is asdfgh\n\`\`\`\n[muzhiming](https://www.runoob.comjavascript:;) muzhiming\n\n muz***ing_zbq@163.com\n\n8年前 (2018-02-02)\n#0 yy\n\n 169***3930@qq.com\n\n 132**>** 重定向输出到某个位置，替换原有文件的所有内容。\n\n\n**>>** 重定向追加到某个位置，在原有文件的末尾添加内容。\n\n\n**** 重定向错误输出。\n\n\n**2>>** 重定向错误追加输出到文件末尾。\n\n\n**&>** 混合输出错误的和正确的都输出。\n\n[yy](https://www.runoob.comjavascript:;) yy\n\n 169***3930@qq.com\n\n7年前 (2019-08-06)\n \n\n \n \n\n \n \n \n### 点我分享笔记\n\n \n \n \n \n \n \n [取消](https://www.runoob.comjavascript:;)\n\n\n \n \n \n \n \n \n\n\n 分享笔记\n \n \n \n \n \n \n\n 昵称昵称 (必填)\n 邮箱邮箱 (必填)\n 引用地址引用地址\n \n\n \n \n \n \n\n \n \n\n\n\n\n\n\n\n\n\n \n\n \n\n\n\n\n\n\n \n \n \n \n \n \n\n\n \n \n \n \n \n \n \n \n \n\n\n\n\n\n 在线实例\n\n\n ·[HTML 实例](https://www.runoob.com/html/html-examples.html)\n\n\n ·[CSS 实例](https://www.runoob.com/css/css-examples.html)\n\n\n ·[JavaScript 实例](https://www.runoob.com/js/js-examples.html)\n\n\n ·[Ajax 实例](https://www.runoob.com/ajx/ajax-examples.html)\n\n\n ·[jQuery 实例](https://www.runoob.com/jquery/jquery-examples.html)\n\n\n ·[XML 实例](https://www.runoob.com/xml/xml-examples.html)\n\n\n ·[Java 实例](https://www.runoob.com/java/java-examples.html)\n\n\n\n\n\n 字符集&工具\n\n\n · [HTML 字符集设置](https://www.runoob.com/charsets/html-charsets.html)\n\n\n · [HTML ASCII 字符集](https://www.runoob.com/tags/html-ascii.html)\n\n\n · [JS 混淆/加密](https://www.jyshare.com/front-end/6939/)\n\n\n · [PNG/JPEG 图片压缩](https://www.jyshare.com/front-end/6232/)\n\n\n · [HTML 拾色器](https://www.runoob.com/tags/html-colorpicker.html)\n\n\n · [JSON 格式化工具](https://www.jyshare.com/front-end/53)\n\n\n · [随机数生成器](https://www.jyshare.com/front-end/6680/)\n\n\n\n\n 最新更新\n\n\n ·\n [\n OpenCode 自定义... ](http://www.runoob.com/opencode/opencode-custom-tools.html)\n\n\n ·\n [\n OpenCode Skills ](http://www.runoob.com/opencode/opencode-skills.html)\n\n\n ·\n [\n OpenCode MCP 服... ](http://www.runoob.com/opencode/opencode-mcp.html)\n\n\n ·\n [\n OpenCode LSP 服... ](http://www.runoob.com/opencode/opencode-lsp.html)\n\n\n ·\n [\n OpenCode 权限配置 ](http://www.runoob.com/opencode/opencode-permissions.html)\n\n\n ·\n [\n OpenCode 格式化... ](http://www.runoob.com/opencode/opencode-formatter.html)\n\n\n ·\n [\n OpenCode 自定义... ](http://www.runoob.com/opencode/opencode-commands.html)\n\n\n\n\n 站点信息\n\n\n ·\n [意见反馈](https://www.runoob.commailto:admin@runoob.com)\n\n\n ·\n [免责声明](https://www.runoob.com/disclaimer)\n\n\n ·\n [关于我们](https://www.runoob.com/aboutus)\n\n\n ·\n [文章归档](https://www.runoob.com/archives)\n\n\n\n\n\n\n\n **关注微信**\n\n\n\n \n\n\n\n\n\n\n Copyright © 2013-2026 **[菜鸟教程](https://www.runoob.com//www.runoob.com/)** \n **[runoob.com](https://www.runoob.com//www.runoob.com/)** All Rights Reserved. 备案号：[闽ICP备15012807号-1](https://beian.miit.gov.cn/)\n\n\n\n [ ](https://www.runoob.comjavascript:void(0))\n [](https://www.runoob.comjavascript:void(0))\n [](https://www.runoob.comjavascript:void(0))\n\n\n\n#### 微信关注\n\n `;
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