该命令运行起来应该是这样： ```bash ~# fruit-mgr <<<<<<<<<< "输入命令" ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager <<<<<<<<<< "输出欢迎词" ~# ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager ~# fruit-mgr list --help <<<<<<<<<< "查看 list 命令的帮助" ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager ~# fruit-mgr list --help Description: List all fruits Usage: fruit-mgr list --filter <<<<<<<<<< "输出帮助" ~# ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager ~# fruit-mgr list --help Description: List all fruits Usage: fruit-mgr list --filter ~# fruit-mgr list <<<<<<<<<< "输入命令列出水果" ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager ~# fruit-mgr list --help Description: List all fruits Usage: fruit-mgr list --filter ~# fruit-mgr list Apple Banana Orange <<<<<<<<<< "输出水果列表" ~# ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager ~# fruit-mgr list --help Description: List all fruits Usage: fruit-mgr list --filter ~# fruit-mgr list Apple <<<<<<<<<< "当然，我们可以使用 --filter 来过滤出 Apple" Banana Orange ~# ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager ~# fruit-mgr list --help Description: List all fruits Usage: fruit-mgr list --filter ~# fruit-mgr list Apple Banana Orange ~# fruit-mgr list --filter A <<<<<<<<<< "过滤出名字含大写 A 的水果" ``` --- ```bash ~# fruit-mgr Welcome to use FruitManager ~# fruit-mgr list --help Description: List all fruits Usage: fruit-mgr list --filter ~# fruit-mgr list Apple Banana Orange ~# fruit-mgr list --filter A Apple <<<<<<<<<< "只输出 Apple" ~# ```