ワンライナーで Data::Dumper
こうするだけ
% perl -MData::Dumper -e 'print Dumper(\@INC), "\n"' $VAR1 = [ '/usr/lib/perl5/5.8/cygwin', '/usr/lib/perl5/5.8', '/usr/lib/perl5/site_perl/5.8/cygwin', '/usr/lib/perl5/site_perl/5.8', '/usr/lib/perl5/site_perl/5.8', '/usr/lib/perl5/vendor_perl/5.8/cygwin', '/usr/lib/perl5/vendor_perl/5.8', '/usr/lib/perl5/vendor_perl/5.8', '.' ];
全然簡単だって。マジデ。