The portability problem with $ENV{PWD} is that it assumes Unix. `pwd` also assumes Unix. The OP said "though I could replace the Cwd::cwd() calls with `pwd` (for Unix only), I'd prefer a more portable solution."

In addition, $PWD isn't a bashism. csh and ksh also populate it.

In reply to Re^4: Surprising behavior of Cwd module on Unix with symlinks by DrHyde
in thread Surprising behavior of Cwd module on Unix with symlinks by Anonymous Monk

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