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#!/usr/bin/env perl
# "dumpcpanurls" - list the mirrors CPAN.pm is configured to try
...
use CPAN ;
CPAN::Config->load ;
print join qq{\n}, @{$CPAN::Config->{'urllist'}} ;

perl -MCPAN -le "CPAN::Config->load; print join qq(\n)=> @{ \$CPAN::Co
+nfig->{urllist} }"
#                                                remove this^ escape f
+or windows shell

dumpcpanurls | perl -le 'do{s#^\w+p://([^/]+).*#$1#;print} for(<STDIN>
+)' \
  | xargs --max-args 1 ping -c 2

dumpcpanurls | perl -le 'do{s#^\w+p://([^/]+).*#$1#;print} for(<STDIN>
+)' \
  | xargs netselect -vv

perl -MCPAN -le \
      'CPAN::Config->load;
       system "netselect", "-vv",
          map { s#^\w+p://([^/]+).*#$1# && $_ || ""}
                      @{ $CPAN::Config->{urllist} } '

     perl -MCPAN -le \
     'CPAN::Config->load;
...
         s#^\w+p://([^/]+).*#$1# &&
           push @hosts => $_          }
      system("netselect", "-vv", @hosts) if @hosts'