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< h1 id = "构建一个简单命令行程序" > < a class = "header" href = "#构建一个简单命令行程序" > 构建一个简单命令行程序< / a > < / h1 >
< p > 在前往更高的山峰前，我们应该驻足欣赏下身后的风景，虽然是半览众山不咋小，但总比身在此山中无法窥全貌要强一丢丢。< / p >
< p > 在本章中，我们将一起构建一个命令行程序，目标是尽可能帮大家融会贯通之前的学到的知识。< / p >
< p > linux 系统中的 < code > grep< / code > 命令很强大，可以完成各种文件搜索任务，我们肯定做不了那么强大，但是假冒一个伪劣的版本还是可以的，它将从命令行参数中读取指定的文件名和字符串，然后在相应的文件中找到包含该字符串的内容，最终打印出来。< / p >
< blockquote >
< p > 这里推荐一位大神写的知名 Rust 项目 < a href = "https://github.com/BurntSushi/ripgrep" > ripgrep< / a > ，绝对是 < code > grep< / code > 真正的高替品，值得学习和使用< / p >
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