man rm

   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 might be possible to recover some of its contents, given suffi?
   cient expertise and/or time.  For greater assurance that the  contents  are  truly  unrecoverable,  consider
   using shred.

man rm

原文：https://blog.51cto.com/14012942/2446309