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In today's tutorial, we will be writing a web crawler using Perl. The code will download raw HTML from a website, find URLs in the HTML, retrieve and store them as files. Initially, we will download from around 10 websites to keep it simple. However, you can choose to download as many websites as you have disk space for. The downloaded files will be numbered as html files (0.html, 1.html, etc.) and a map file will contain the file number and original URL. Let's start by writing the Perl code for the web crawler as a program named web crawler dot pl.