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in todays short class were going to take a look at some example perl code and were going to write a web crawler using perl this is going to be just a very simple piece of code thats going to go to a website download the raw html iterate through that html and find the urls and retrieve those urls and store them as a file were going to create a series of files and in our initial iteration were going to choose just about 10 or so websites just so that we get to the end and we dont download everything if you want to play along at home you can of course download as many websites as you have disk space for so well choose websites at random and what were going to write is a series of html files numbered 0.html1.html 2.html and so on and then a map file that contains the number and the original url so lets get started with the perl code so were going to write a program called web crawler dot pl heres our web crawler were going to start as weve done before with whats called the
