#!/usr/bin/env ruby
#---
# Excerpted from "Build Awesome Command-Line Applications in Ruby",
# published by The Pragmatic Bookshelf.
# Copyrights apply to this code. It may not be used to create training material, 
# courses, books, articles, and the like. Contact us if you are in doubt.
# We make no guarantees that this code is fit for any purpose. 
# Visit http://www.pragmaticprogrammer.com/titles/dccar for more book information.
#---
database = ARGV.shift
username = ARGV.shift
password = ARGV.shift
end_of_iter = ARGV.shift
if end_of_iter.nil?
  backup_file = database + Time.now.strftime("%Y%m%d")
else
  backup_file = database + end_of_iter
end
`mysqldump -u#{username} -p#{password} #{database} > #{backup_file}.sql`
`gzip #{backup_file}.sql`