Download from specific URL and save it to the file. Example 1: wget('http://example.com/index.html', 'example.html') => example.html Example 2: wget('http://example.com/index.html') => index.html

wget.rb

#!/usr/bin/ruby
# -*- mode:ruby; coding:utf-8 -*-

require 'open-uri'

def wget(url, fileName='')

  if fileName == '' then
    fileName = File.basename(url)
  end

  open(fileName, 'wb') do |output|
    open(url) do |data|
      output.write(data.read)
    end
  end

  if File.exist?(fileName) then
    return fileName
  else
    return nil
  end

end

# main
if $0 == __FILE__ then

  fileName = nil

  if ARGV.length == 1 then
    fileName = wget(ARGV[0])
  elsif ARGV.length == 2 then
    wget(ARGV[0], ARGV[1])
  else
    raise ArgumentError
  end

  if fileName != nil
    puts ARGV[0] + ' => ' + fileName
    exit 0
  else
    puts 'Failed to save.'
    exit 1
  end

end