rm可以用来删除文件和文件夹。 

rm –help

Usage: rm [OPTION]… FILE…
Remove (unlink) the FILE(s).

  -f, –force           ignore nonexistent files, never prompt（提示）
  -i                    prompt before every removal
  -I                    prompt once before removing more than three files, or
                          when removing recursively.  Less intrusive than -i,
                          while still giving protection against most mistakes
      –interactive[=WHEN]  prompt according to WHEN: never, once (-I), or
                          always (-i).  Without WHEN, prompt always
      –one-file-system  when removing a hierarchy recursively, skip any
                          directory that is on a file system different from
                          that of the corresponding command line argument
      –no-preserve-root  do not treat `/\’ specially
      –preserve-root   do not remove `/\’ (default)
  -r, -R, –recursive   remove directories and their contents recursively（递归地）
  -v, –verbose         explain what is being done
      –help     display this help and exit
      –version  output version information and exit

By default, rm does not remove directories.  Use the –recursive (-r or -R)
option to remove each listed directory, too, along with all of its contents.

To remove a file whose name starts with a `-\’, for example `-foo\’,
use one of these commands:
  rm — -foo

  rm ./-foo

Note that if you use rm to remove a file, it is usually possible to recover
the contents of that file.  If you want more assurance that the contents are
truly unrecoverable, consider using shred.

Report rm bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils \’rm invocation\’>

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