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  1. or download this
    #!/usr/bin/perl

...

say "File::Spec::canonpath";
foreach my $pth (@pth) { resolves $pth, File::Spec->canonpath ($pth); 
+  }
  2. or download this
    OP
/a/b/c/d/../../../e  -> /a/e
...
../scripting         -> ../scripting
./tmp                -> tmp
/tmp/../../../tmp    -> /tmp/../../../tmp