Where and are replaced with the appropriate user home directory path and user name, respectively.
在此，和分别被合适的用户主目录路径和用户名称所取代。
Because your home directory is usually not on your path (and generally should not be), you will need to explicitly provide a path for any executable that you want to run from your home directory.
表示当前目录的子目录。由于您的主目录通常并不在(通常来讲也不应该在)PATH中，因此需要显式地为您希望从主目录中运行的任何可执行文件提供一个路径。
If you're in some other directory, there's no need to go home first or to type the full directory path. Just use the tilde character.
如果您位于其他目录中，不必先返回主目录或者键入完整的目录路径，只需使用波浪号即可。
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