use したモジュールの位置を出力する

perlは一度読んだファイルをこの変数の中に押し込む。たとえばこんな感じ。

% perl -MEncode -le 'print "$_:$INC{$_}" for sort keys %INC'
Encode.pm:/usr/local/lib/perl5/5.10.0/darwin-thread-multi-2level/Encode.pm
Encode/Alias.pm:/usr/local/lib/perl5/5.10.0/darwin-thread-multi-2level/Encode/Alias.pm
Encode/Config.pm:/usr/local/lib/perl5/5.10.0/darwin-thread-multi-2level/Encode/Config.pm
Encode/Encoding.pm:/usr/local/lib/perl5/5.10.0/darwin-thread-multi-2level/Encode/Encoding.pm
Exporter.pm:/usr/local/lib/perl5/5.10.0/Exporter.pm
XSLoader.pm:/usr/local/lib/perl5/5.10.0/darwin-thread-multi-2level/XSLoader.pm
base.pm:/usr/local/lib/perl5/5.10.0/base.pm
bytes.pm:/usr/local/lib/perl5/5.10.0/bytes.pm
strict.pm:/usr/local/lib/perl5/5.10.0/strict.pm
vars.pm:/usr/local/lib/perl5/5.10.0/vars.pm
warnings.pm:/usr/local/lib/perl5/5.10.0/warnings.pm
warnings/register.pm:/usr/local/lib/perl5/5.10.0/warnings/register.pm