If you want to check which modules have been loaded by your script (and where they were found), just add the following line at the end of your script: for(keys %INC) { print "$_: $INC{$_}\n" };

I recommend using perldebug, which is more clear and simple: 
perl -MFile::copy -de0

  DB<1> M
'Carp.pm' => '1.50 from C:/Strawberry/perl/lib/Carp.pm'
'Config.pm' => '5.032001 from C:/Strawberry/perl/lib/Config.pm'
'Config_git.pl' => 'C:/Strawberry/perl/lib/Config_git.pl'
'Config_heavy.pl' => 'C:/Strawberry/perl/lib/Config_heavy.pl'
'Cwd.pm' => '3.78 from C:/Strawberry/perl/lib/Cwd.pm'
'DynaLoader.pm' => '1.47_01 from C:/Strawberry/perl/lib/DynaLoader.pm'
'Exporter.pm' => '5.74 from C:/Strawberry/perl/lib/Exporter.pm'
'File/Spec.pm' => '3.78 from C:/Strawberry/perl/lib/File/Spec.pm'
'File/Spec/Unix.pm' => '3.78 from C:/Strawberry/perl/lib/File/Spec/Uni
+x.pm'
'File/Spec/Win32.pm' => '3.79 from C:/Strawberry/perl/lib/File/Spec/Wi
+n32.pm'
'File/copy.pm' => 'C:/Strawberry/perl/lib/File/copy.pm'
'IO.pm' => '1.45 from C:/Strawberry/perl/lib/IO.pm'
'IO/Handle.pm' => '1.45 from C:/Strawberry/perl/lib/IO/Handle.pm'
'List/Util.pm' => '1.55 from C:/Strawberry/perl/lib/List/Util.pm'
'Scalar/Util.pm' => '1.55 from C:/Strawberry/perl/lib/Scalar/Util.pm'
'SelectSaver.pm' => '1.02 from C:/Strawberry/perl/lib/SelectSaver.pm'
'SelfLoader.pm' => '1.26 from C:/Strawberry/perl/lib/SelfLoader.pm'
'Symbol.pm' => '1.08 from C:/Strawberry/perl/lib/Symbol.pm'
'Term/Cap.pm' => '1.17 from C:/Strawberry/perl/lib/Term/Cap.pm'
'Term/ReadKey.pm' => '2.38 from C:/Strawberry/perl/vendor/lib/Term/Rea
+dKey.pm'
'Term/ReadLine.pm' => '1.17 from C:/Strawberry/perl/lib/Term/ReadLine.
+pm'
'Term/ReadLine/Perl.pm' => '1.0303 from C:/Strawberry/perl/vendor/lib/
+Term/ReadLine/Perl.pm'
'Term/ReadLine/readline.pm' => '1.0303 from C:/Strawberry/perl/vendor/
+lib/Term/ReadLine/readline.pm'
'Time/HiRes.pm' => '1.9764 from C:/Strawberry/perl/lib/Time/HiRes.pm'
'Win32.pm' => '0.54 from C:/Strawberry/perl/lib/Win32.pm'
'XSLoader.pm' => '0.30 from C:/Strawberry/perl/lib/XSLoader.pm'
'constant.pm' => '1.33 from C:/Strawberry/perl/lib/constant.pm'
'feature.pm' => '1.58 from C:/Strawberry/perl/lib/feature.pm'
'overload.pm' => '1.31 from C:/Strawberry/perl/lib/overload.pm'
'overloading.pm' => '0.02 from C:/Strawberry/perl/lib/overloading.pm'
'perl5db.pl' => '1.57 from C:/Strawberry/perl/lib/perl5db.pl'
'strict.pm' => '1.11 from C:/Strawberry/perl/lib/strict.pm'
'vars.pm' => '1.05 from C:/Strawberry/perl/lib/vars.pm'
'warnings.pm' => '1.47 from C:/Strawberry/perl/lib/warnings.pm'
'warnings/register.pm' => '1.04 from C:/Strawberry/perl/lib/warnings/r
+egister.pm'

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I am trying to improve my English skills, if you see a mistake please feel free to reply or /msg me a correction

In reply to Re^2: help with "symbol lookup error" message by xiaoyafeng
in thread help with "symbol lookup error" message by Special_K

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