$ perl -E 'print("Hello, world!\n"); say $INC{"IO/File.pm"};' Hello, world! $ perl -E 'STDOUT->print("Hello, world!\n"); say $INC{"IO/File.pm"};' Hello, world! /home/ken/perl5/perlbrew/perls/perl-5.36.0/lib/5.36.0/cygwin-thread-multi/IO/File.pm