命令 3 显示了 url_list.txt 文件，简单的文本目录中包含了两个 URL；命令 4 则对这两个 URL 进行下载。

Command 3 shows url_list.txt, a simple text catalog containing two URLs; Command 4 downloads the two URLs.

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第一，用户可以在目录中执行文本搜索并查看匹配的商品。

First, the user can perform a text search on the catalog and see matching items.

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您将看到几个文本文件、脚本和源目录。

You'll see several text files, scripts, and source directories.

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