Ruby invoking graphicsmagick to make images blue because I'm too lazy to learn shell loops

ruby-wrap-graphicsmagick-blue.rb

Sector.all.each do |sector|
  files = Dir.glob("./**/skift/#{sector.slug}.png").reject{|f| f =~ /-blue\.\w{3,4}$/}

  files.each do |fname|
    cmd = "convert #{fname} -fill '#2b74a5' +opaque darkblue #{fname}"
    puts cmd
    `#{cmd}` 
  end
end