# the first letter of the setting is used for parameters
settings = {
  :port     => 8000,
  :number   => 3,
  :app_path => File.join(%w{/ home manveru darcs nitroproject examples hello}),
  :mode     => 'live', # live|stage|debug
  :server   => 'mongrel' # mongrel|webrick
}

settings.each do |setting, default|
  arg = ARGV.join(' ').scan(/-#{setting.to_s[0,1]} (.*?) /).to_s
  settings[setting] = arg.empty? ? default : arg
end

cmd = "ruby %{app_path}/run.rb --%{server} --%{mode} --port %{port} 1>>log/access.log 2>>log/error.log 0>&- &"
#cmd = "ruby %{app_path}/run.rb --%{server} --%{mode} --port %{port} &"

1.upto(settings[:number]) do |i|
  hash = settings.dup
  hash[:port] += (i - 1)
  this = cmd.gsub(/%\{(.*?)\}/){|e| hash[$1.to_sym]}
  puts this
  system(this)
end