The problem is in order to do it properly the environment variables DASP and DASU need to be set which are for an encrypted password and username respectively.

Passing passwords via environment is as insecure as via command line. But I guess that's nothing you can change. (Else, try passing the password via a file handle to an anonymous pipe.)

For setting environment variables for a child process, try something like this:

#!/usr/bin/perl

use strict;
use warnings;

my $pid=fork();
defined($pid) or die "Can't fork: $!";
if ($pid) {
    # parent
    print "Parent waiting for the child ...\n";
    waitpid($pid,0);
    print "Child has exited, exit code = $?\n";
} else {
    # child
    chdir('/tmp') or die "Can't chdir to /tmp: $!";
    %ENV=(); # completely clear environment, for shorter demo output, 
+maybe also for security
    $ENV{'PATH'}='/bin:/usr/bin';
    $ENV{'FOO'}='foo fofoo fofofooo';
    $ENV{'BAR'}='bar bar barrrrrrrrrk';
    exec($^X,'-e','print "* Hello from a new perl\n";print `pwd`;print
+ "* $_=$ENV{$_}\n" for sort keys %ENV; print "* bye\n"')
        or die "Can't execute $^X: $!";
    # not reached
}
[download]

Output:

>perl envchild.pl
Parent waiting for the child ...
* Hello from a new perl
/tmp
* BAR=bar bar barrrrrrrrrk
* FOO=foo fofoo fofofooo
* PATH=/bin:/usr/bin
* bye
Child has exited, exit code = 0
>
[download]

Alexander