This probably isn't your actual problem, but it is a flakey waiting to happen, in that metacharacters in your arguments may make the substituitions do more than you expect. This: 
if($#ARGV > 2)
  {
    $message = join (" ",@ARGV);
    $message =~ s/$username//;
    $message =~ s/$password//;
    $message =~ s/$on_off//;
  }

[download]
would be better as: 
if($#ARGV >2 ) 
  {
    $message = join (" ",@ARGV[3..$#ARGV]);
  }

[download]
Either that or use e.g. quotemeta($password) in the first part of your substitutions.

--Bob Niederman, http://bob-n.com

In reply to Re: Expect module & su by bobn
in thread Expect module & su by jcpunk

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