If you're wanting to ensure they only use one option, it seems the easiest would be to only allow one option. For example: 
GetOptions(
           'request|r=s' =>\$Request,
           'man|m'     =>\$Manual,
           'help|h|?'  =>\$Help
          );

if ($Request =~ /^list$/i)
{
   # whatever
}
elsif ($Request =~ /^view$/i)
{
   # whatever
}
# and so  on

[download]

But I may be misunderstanding the issue. Not an uncommon event in my life.

If things get any worse, I'll have to ask you to stop helping me.

In reply to (shockme) Re: More on Processing Command Line Arguments by shockme
in thread More on Processing Command Line Arguments by Ninthwave

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