Unix Naive Bare-bone Perl Web Spider: The following is a bare-bone custom depth-level web spider. It does not need any module installed , just the utilitary curl and perl.Does not know to fetch duplicate links. 
#!/usr/bin/perl 
use strict;
use warnings;
#recursive spider web starting from a page and
#specifying depth level
#like wget -r --level=...
my ($depth_level,$start_page) = @ARGV;
exit 1 unless $start_page;#exits if it doesn't have a parameter page t
+o download
if( !defined $depth_level || $depth_level > 0 ) {
    my $page_content=`curl $start_page 2>&1`;#takes contents of the pa
+ge
    my @links = $page_content =~ /<a href=([^ ]*?)>/g;#takes out the l
+inks from the page
    for(@links) {
        print "Working on link $_\n";
        my $new_call = "perl naive_crawler.pl ". ($depth_level - 1) ."
+ $_";#new call for the script with the links from the page
        `$new_call`;
    };
}

[download]
If you decide to run the script here's how: perl naive_spider.pl 2 "http://code.google.com/hosting/"

In reply to unix perl web spider by spx2

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