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Description of problem:
In man page of irssi, it is shown that option --usage is a valid option. However, help message doesn't list this option as a valid option. Running irssi with option --usage will show error message.

Version-Release number of selected component (if applicable):
irssi-0.8.15-3.el6.x86_64

How reproducible: Always

Steps to Reproduce:
1. Check man pages (option --usage is a valid option)
2. Check help message (option --usage is not a valid option)
3. Run 'irssi --usage'
  
Actual results:
Unknown option --usage
Run 'irssi --help' to see a full list of available command line options.

Expected results:
Display brief usage message or remove option --usage from manual page.

Additional info:

Created attachment 602146 [details]
Proposed fix

Leftover from popt, removing from man.

Fix sent upstream.

Upstream ticket:
http://bugs.irssi.org/index.php?do=details&task_id=873&project=5&pagenum=12

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Previously in the man page there was documented non implemented option --usage. This was leftover from old irssi version when popt was used. Later the code switched to glib's goption, but the documentation wasn't change. The documentation was updated and it is now correct.

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.

http://rhn.redhat.com/errata/RHBA-2012-1171.html