[Bug 215836] [PATCH] sbin/dmesg: support new flag for watching messages

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215836

            Bug ID: 215836
           Summary: [PATCH] sbin/dmesg: support new flag for watching
                    messages
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: joe at thrallingpenguin.com
          Keywords: patch

Created attachment 178581
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178581&action=edit
sbin/dmesg: add -w option w/docs

This patch introduces an option -w for displaying the kernel messages,
repeatedly. When combined with the -c option, it tails kernel messages.

This is invaluable for environments where accessing the live console isn't
feasible; but watching the messages with as little overhead as possible is
desired.

Patch includes MAN page update too.

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