本文详细解析了ls命令的使用方法及其参数，包括如何通过-l选项查看文件和目录的详细权限信息，如文件类型、权限、链接数、拥有者、所属组、大小、修改时间以及文件名。
ls(1) is used to display permission information (and more) for files and directories. When it is invoked with the "-l" option, it displays the following information in the order given.
Type of file (first character)
Access permission of the file (nine characters, consisting of three characters each for user, group, and other in this order)
Number of hard links to the file
Name of the user who owns the file
Name of the group which the file belongs to
Size of the file in characters (bytes)
Date and time of the file (mtime)
Name of the file
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Type of file (first character)
Access permission of the file (nine characters, consisting of three characters each for user, group, and other in this order)
Number of hard links to the file
Name of the user who owns the file
Name of the group which the file belongs to
Size of the file in characters (bytes)
Date and time of the file (mtime)
Name of the file
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