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/usr/share/courier/webadmin/dumpenv.pl is in courier-webadmin 0.68.2-1ubuntu3.

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#! /usr/bin/perl

foreach (keys %ENV)
{
    my $v=$ENV{$_};

    $v =~ s:\\:\\\\:g;
    $v =~ s:\n:\\n:g;

    print "$_=$v\n";
}