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I appreciate the feedback ++
To get rid of the unix limitation you could die without $ENV{HOME}, or use File::HomeDir.
You are correct: the reason for my self-imposed unix limitation is that I was unaware of how to handle $ENV{HOME} in a portable way. Thanks for bringing the File::HomeDir module to my attention. For my purposes, I have come to realize that it is important to only use core modules in this script. The original version of the script used the non-core List::MoreUtils. I ran into problems on one system configuration here @work which, unbelievably, did not have it installed. So I could not even analyze what modules were installed because my script died because it could not use a module!

I will take a look at the File::HomeDir source code to see if I can incorporate its techniques for making findpm portable.

Whoops, I just realized pminst is broken in 2 ways
I am also aware of 2 bugs in pminst:
  1. It completely misses some modules.
  2. It unnecessarily duplicates some modules in its output. I believe this is the same as the MSWin32-x86-multi-thread issue you mentioned. It does not seem to handle all of the @INC paths gracefully. At first, I was willing to concede that my sysadmins set @INC in an unconventional manner... until you mentioned that it was also an issue for your system.

I should file a bug report on CPAN. Unfortunately, it is not obvious to me how to patch the code. I guess this is the reason I created the findpm script in the first place.

Update: Someone has reported a bug:

In reply to Re^2: Find installed Perl modules matching a regular expression by toolic
in thread Find installed Perl modules matching a regular expression by toolic

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