rm: can't delete a filename including a dash

[mknos]

• A filename starting with a dash can be given as an argument like this: ./-o-
• The cp program seems to support this but rm does not (see below)
• I also tested a file called a-b
• Debugging showed that preprocessed_args is incorrectly ['-c','-p','-.','-1']
• Stepping through preprocess_options() revealed a regex on L146 which was not bound to the start of the string

  %perl cp cp ./-cp.1
  %perl rm ./-cp.1 
  Unknown option: c
  Unknown option: p
  Unknown option: .
  Unknown option: 1
  Usage: rm [-fiPrRv] file ...

[coveralls]

Pull Request Test Coverage Report for Build 9975239182

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.016%

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Totals
Change from base Build 9959948277:	0.0%
Covered Lines:	382
Relevant Lines:	496

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💛 - Coveralls

[briandfoy]

changes: fix option processing so a filename containing a dash is not included.