Ah, thank you fellow monks for the insight. (actually, I tried tye's way, but it did not work then) Thus:

BEGIN{
    unless (defined $ENV{APPLEJACK}){
      $ENV{APPLEJACK}= "TRUEBLUE";
      exec( $^X, $0, @ARGV );
      exit 0; # we actually never get here
    }
}

print "STARTING " . $ENV{APPLEJACK} . "\n";

[download]

prints:

STARTING TRUEBLUE

[download]

In reply to Re^2: setting PERL_PERTURB_KEYS & PERL_HASH_SEED in a perl file by FreeBeerReekingMonk
in thread setting PERL_PERTURB_KEYS & PERL_HASH_SEED in a perl file by gravid

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