No clue what rhn_check does since up2date doesn't include an ounce of
documentation, but it gives nice python errors when you run it with --help
or -help

---
[root@respect /root]# rhn_check -help
Traceback (innermost last):
  File "/usr/sbin/rhn_check", line 370, in ?
    ["verbose"])
  File "/usr/lib/python1.5/getopt.py", line 60, in getopt
    opts, args = do_shorts(opts, args[0][1:], shortopts, args[1:])
  File "/usr/lib/python1.5/getopt.py", line 102, in do_shorts
    if short_has_arg(opt, shortopts):
  File "/usr/lib/python1.5/getopt.py", line 117, in short_has_arg
    raise error, 'option -%s not recognized' % opt
getopt.error: option -h not recognized