[Bug 282143] grep -v does nothing

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282143

            Bug ID: 282143
           Summary: grep -v does nothing
           Product: Base System
           Version: 13.4-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: b...@freebsd.org
          Reporter: c+free...@dahoffmann.de

grep(1) mentions -v to print only non-matching lines, but this seems not to be
implemented (with a quick look ath the source)

i.e: tail -F /var/log/maillog | grep manylines | grep -v without_this_pattern
doesn't print anything at all.

best regards
Daniel

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