If I understand you question correctly, you could attempt a solution where you run ksh from backticks, and have ksh tell you what it's environment is. For example: 

{
  my @lines = `/bin/ksh -c ". oraenv -d; set"`;
  for (@lines) {
    next unless /=/;
    my($k,$v) = split /=/, $_, 2;
    $ENV{$k} = $v;
  }
}

[download]

That should call /bin/ksh so it runs the script and then it has /bin/ksh run set, which dumps all the variables of the shell, and the results of the set should then be parsed and inserted into %ENV

I forewarn that that code is untested.

In reply to Re: Modifying ENV variable of parent process by wog
in thread Modifying ENV variable of parent process by Tuna

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