rm(remove)
rm(remove)功能说明：删除文件或目录。
语 法：rm [-dfirv][--help][--version][文件或目录...]
补充说明：执行rm指令可删除文件或目录，如欲删除目录必须加上参数"-r"，否则预设仅会删除文件。
参 数：
-d或--directory 直接把欲删除的目录的硬连接数据删成0，删除该目录。
-f或--force 强制删除文件或目录。
-i或--interactive 删除既有文件或目录之前先询问用户。
-r或-R或--recursive 递归处理，将指定目录下的所有文件及子目录一并处理。
-v或--verbose 显示指令执行过程。
--help 在线帮助。
--version 显示版本信息。
rm
rm [options] files
Delete one or more files. To remove a file, you must have write permission in the directory that contains the file, but you need not have permission on the file itself. If you do not have write permission on the file, you will be prompted (y or n) to override. rm is often aliased to rm -i, especially for the root user, to protect against inadvertently deleting files.
Options
Remove directories, even if they are not empty. Available only to a privileged user.
Remove write-protected files without prompting.
Print a help message and then exit.
Prompt for y (remove the file) or n (do not remove the file).
Do not treat root (/) specially. This is the default.
Do not operate recursively on root (/).
If file is a directory, remove the entire directory and all its contents, including subdirectories. Be forewarned: use of this option can be dangerous.
Verbose mode (print the name of each file before removing it).
Print version information and then exit.
Mark the end of options. Use this when you need to supply a filename beginning with -.