The code presented here reads through one or more directories specified on the command line, and prints some information about each entry found in the directories.
这里所介绍的代码将浏览命令行中指定的一个或多个目录，并显示在该目录中找到的每个条目的相关信息。
2
When adding keys to the ssh_known_hosts file, ensure that the key is not split into multiple lines and that each host's entry is on a separate line.