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In today's class, we will be exploring Perl code to build a web crawler. This code will extract URLs from websites and save them as files. Initially, we will work on downloading and storing URLs from around 10 websites. However, you can expand this to any number of websites you have disk space for. The program will create HTML files numbered sequentially and a map file with the URL and corresponding number. Let's begin by writing the Perl program named web crawler.pl.
