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copied!<p>I'm going to answer by recommending looking at the new-ish "<a href="https://github.com/injekt/slop" rel="nofollow noreferrer">slop</a>" gem. It's a wrapper around <code>getoptlong</code>. </p> <p>You can use <code>gem install slop</code> if you're using RVM, or <code>sudo gem install slop</code> otherwise.</p> <p>GetOptLong is very powerful but, though I've used it several times, I still have to go review the docs each time. </p> <p>If you want a bit more power, with an "easier to use interface than GetOptLong", look into Ruby's <a href="http://www.ruby-doc.org/stdlib/libdoc/optparse/rdoc/index.html" rel="nofollow noreferrer"><code>OptionParser</code></a>. You'll need to work out the logic better, but this is a quick pass converting your code. I had to stub out a class for the CommonLog gem because I don't use it. The important stuff follows the line pulling log from <code>ARGV</code>:</p> <pre><code>require 'optparse' class CommonLog def initialize(*args); end def urlReport(); puts "running urlReport()"; end def ipReport(); puts "running ipReport()"; end def statReport(arg); puts "running statReport(#{arg})"; end end log = CommonLog.new(ARGV[0]) OptionParser.new { |opts| opts.banner = "Usage: #{File.basename($0)} -u -i -s filename" opts.on( '-u', '--[no-]url', 'some short text describing URL') do log.urlReport() end opts.on('-i', '--[no-]ip', 'some short text describing IP') do log.ipReport() end opts.on('-s', '--stat FILENAME', 'some short text describing STAT') do |arg| log.statReport(arg) end }.parse! </code></pre> <p>Also, as a quick critique, you are not writing idiomatic Ruby code:</p> <ul> <li><code>when</code> statements can be written: <code>when "-h", "--help"</code></li> <li><code>if ARGV[0] == nil || ARGV.size != 1</code> is convoluted. Study up on how ARGV and arrays work. Normally, for <code>ARGV[0]</code> to be nil there will be no more arguments, so <code>ARGV.empty?</code> would probably suffice.</li> </ul>

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