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Description of problem:

In mcelog man page is briefly mentioned --help argument:
"
       When the --cpu=cputype option is specified set the to be decoded CPU to cputype.  See mcelog  --help  for  a
       list  of  valid CPUs.  Note that specifying an incorrect CPU can lead to incorrect decoding output.  Default
       is either the CPU of the machine that reported the machine check (needs a newer kernel version) or  the  CPU

"

when you run mcelog --help it would at first write: "mcelog: unrecognized option '--help'" and after that it prints out help message with list of command to stderr and mcelog would return error code 1.


Because --help argument is mentioned in manpage I think it should not print "unrecognized option" or it should not be mentioned in manpage.


My recomendation.

add --help to argument list, print help message to stdout, and return 0
OR
remove --help from manpage

On same matter actually also 'mcelog --version' outputs everything to stderr.
To me it seems to be wrong.

Sent patch to Andi upstream, patch was accepted.

916015663906 ("mcelog: Add --help option.")

P.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0991