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See how Vincent Foley makes a local copy of the slides Matz put up:

 require "open-uri" 

 BASE_URL = "http://www.rubyist.net/~matz/slides/oscon2005/mgp" 
 "00001".upto("00059") do |n|
   puts "Fetching #{n}.html..." 
   File.open(n + ".html", "w") do |f|
     f.write(open(BASE_URL + n + ".html").read)
   end
 end

The part I’m digging is that "00001".upto("00059"). I totally forgot about String.upto, which does a succ behind the scenes.

 >> "r01".succ
 => "r02" 
 >> "r02".succ
 => "r03" 

But if you want Matz’ slides, let’s also grab the JPEGs.

 require "open-uri" 

 BASE_URL = "http://www.rubyist.net/~matz/slides/oscon2005/" 
 "mgp00001".upto("mgp00059") do |n|
   ['jpg', 'html'].each do |ext|
     puts "Fetching #{n}.#{ext}..." 
     File.open("#{n}.#{ext}", "w") do |f|
       f << open("#{BASE_URL}#{n}.#{ext}").read
     end
   end
 end

We’ve liked succ before, haven’t we? (Lifted from ruby-talk:151295.)