I'm not sure what you're asking for: Learning Perl isn't tied to any platform, and Learning Perl for Win32 is a very old book that won't be updated. We're (as in Stonehenge and the authors of Learning Perl), don't teach a platform specific version of Perl. Learning Perl for Win32 was a reaction to the second edition of Learning Perl where Tom Christiansen let his Windows hatred (and Unix bias) get in the way. Tom Phoenix changed that in the third edition of Learning Perl so we didn't need a Windows version of the book.

A Learning Perl for Unix wouldn't be all that interesting. The interesting parts are where Perl, which is based on a lot of unixisms already, differ on non-unix platforms. Most of the interfaces have been faked or kludged so they work most places already.