Two ways of doing this might be the shell redirect method

  # @exec has the commad that i wish to run
  # but we're throwing away the error meesages
  open (T_RES,"@exec 2>/dev/null |") 
    or die "Unable to fork '@exec': $!";

  while (<T_RES>) {
    # parsing the output
  }
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and the Perl IPC method

  # @exec has the commad that i wish to run

  use IPC::Open3
  my $pid;

  $pid = open (WTR,T_RES,ERR,"@exec") 
    or die "Unable to fork '@exec': $!";

  while (<T_RES>) {
    # parsing the output
  }

  waitpid $pid, 0;  # if necessary, see below
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Thought the shell method might be easier, the IPC::Open3 method might be more portable.

Note:

With the IPC::Open3 method, you might have to waitpid to reap the process.

Hope that helped,
-v