In the rdoc that comes with ruby 1.8.2 (2004-12-08) [i686-linux], two 
things that worked fairly recently (a few months ago, maybe) seem to 
have broken.

1. The -x option should not exclude files specified on the command line, 
but it does:

   rdoc -x . main.txt lib/**/*.rb

produces no doc files (except for doc/created.rid).

2. The --accessor option breaks unless it is given an argument:

$ rdoc --accessor myattr

                              foo.rb: c..c
Generating HTML...
Error in template: Template error: can't find variable 'rw'
Original line:           <td 
class="context-item-value">&nbsp;[%rw%]&nbsp;</td>

$ rdoc --accessor myattr=XYZ

                              foo.rb: c..c
Generating HTML...

Files:   1
Classes: 2
Modules: 0
Methods: 2
Elapsed: 0.248s