[Bug 213007] [patch] sbin/md5/md5.{c,1} make '-c' flag also work with stdin, add '-P' flag to print digest to stderr

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213007

            Bug ID: 213007
           Summary: [patch] sbin/md5/md5.{c,1} make '-c' flag also work
                    with stdin, add '-P' flag to print digest to stderr
           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: marcis.lielturks at gmail.com
          Keywords: patch

Created attachment 175182
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=175182&action=edit
sbin/md5/md5.c patch to apply '-c' to stdin input and add '-P' which outputs
digest to stderr

I thought that extending '-c' to also verify digest, if it was passed from
STDIN, would be useful and allow using md5 in pipeline. For similar reasons I
added option '-P', which resembles '-p', only digest is output to STDERR.

I recently had been writing 11.0-RCx images to USB flash several times, I
started to use pipeline, which fetches and writes image to USB flash directly,
without intermediately storing it on computer. This, however, means that
checksum verification was not straight forward.

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