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def backup
  date = Time.new.strftime("%Y%m%d")
  oracle_drive = ARGV[0]
  backup_drive = "#{ARGV[1]}\\CW\\"

  File.exists?("#{oracle_drive}\\oracle\\ORADB\\BIN\\exp.exe") rescue puts "Invalid oracle drive"; Process.exit!(2)
  File.exists?("#{backup_drive}") rescue puts "Invalid backup drive"; Process.exit!(2)

  %x["#{oracle_drive}\\oracle\\ORADB\\BIN\\exp.exe userid=FOLLETT/FOLLETT
  file=#{backup_drive}#{date}.dmp grants=y owner=follett statistics=none log=#{backup_drive}#{date}.log"]

  if $?.to_i = 0
    files = Dir.entries("#{backup_drive}")[2..-1]
    while files.length >= 20
      deleted_dmp = "#{backup_drive}\\#{files[0]}"
      deleted_log = "#{backup_drive}\\#{files[1]}"
      File.delete(deleted_dmp)
      File.delete(deleted_log)
      files = files[2..-1]
    end
  else
    puts "ERROR"
    Process.exit!(2)
  end
end

def usage
  puts "Correct usage is: backup-cw.rb oracle_drive backup_drive"
  puts "Example: backup-cw.rb C: E:"
end

if __FILE__ == $0
  if ARGV.length != 2
    usage
  else
    backup
  end
end