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  1. or download this
    /path1/perl (5.008005): Export OK
/path2/perl (5.008005): Export not OK
  2. or download this
    $ENV{foo} = "abc";
my $out = `echo \$foo`;
...
print "$^X ($]): Export ",
      $out ne "abc\n" ? "not " : "",
      "OK\n";