Legion

if shell.getRunningProgram() == "disk/startup" then
  print("Installing...")

  if fs.isDir("disk/install") then
    local files = fs.list("disk/install")
    for _,file in ipairs( files ) do
      print("disk/install/"..file.." -> "..file)
      fs.delete(file)
      fs.copy("disk/install/"..file,file)
    end
  else
    print "No files to install. Put install files to directory 'disk/install'"
  end

  if not os.getComputerLabel("label") then
    labelFile = fs.open("disk/label", "r")
    if labelFile then
      label = labelFile.readAll()
      labelFile.close()
      if label == "id" then
        os.setComputerLabel(os.getComputerId())
      else
        os.setComputerLabel(label)
        label = string.gsub(label, '[0-9]+', function (x) return x+1 end)
        labelFile = fs.open("disk/label", "w")
        labelFile.write(label)
        labelFile.close()
      end
      print("Set label to " .. os.getComputerLabel())
    else
      print "No label file. Put label to file 'disk/label'\nIt should contain number, that will be incremented each time"
    end
  end
  print("Done!")
else
  print "Place a disk drive with floppy near computer and copy this program to disk/startup"
end