[Bug 228448] [PATCH] `unlink -foo` , the original use of `unlink`, no longer works.

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228448

            Bug ID: 228448
           Summary: [PATCH] `unlink -foo` , the original use of `unlink`,
                    no longer works.
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: brennan at umanwizard.com

Created attachment 193640
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=193640&action=edit
patch fixing the issue

`unlink -foo` fails, instead of removing a file named `-foo`.

The intended behavior of unlink(1) is to remove the file, as can be seen here,
when it was added back in 1999:
https://svnweb.freebsd.org/base/head/bin/rm/rm.c?r1=53819&r2=54895

Also, this matches POSIX: https://www.unix.com/man-page/posix/1P/unlink/

Patch attached to re-enable the old behavior and also update the documentation.

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