[Bug 10219] New: Warn if list files more than once

[samba-bugs]

https://bugzilla.samba.org/show_bug.cgi?id=10219

           Summary: Warn if list files more than once
           Product: rsync
           Version: 3.0.9
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: core
        AssignedTo: way...@samba.org
        ReportedBy: jida...@jidanni.org
         QAContact: rsync...@samba.org


Wish it would tell me I'm repeating myself.

$ rsync -uva age_grouper Makefile filter extractor extractor extractor
interviewer m.jidanni.org:ceeeeeeee/
building file list ... done
Makefile

See how "real" programs do it:

$ touch f
$ mkdir w
$ cp f f f w
cp: warning: source file ‘f’ specified more than once
cp: warning: source file ‘f’ specified more than once

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