# An non-blocking filehandle read that returns an array of lines read
# Returns:  ($eof,@lines)
my %nonblockGetLines_last;
sub nonblockGetLines {
  my ($fh,$timeout) = @_;

  $timeout = 0 unless defined $timeout;
  my $rfd = '';
  $nonblockGetLines_last{$fh} = ''
		unless defined $nonblockGetLines_last{$fh};

  vec($rfd,fileno($fh),1) = 1;
  return unless select($rfd, undef, undef, $timeout)>=0;
	# I'm not sure the following is necessary?
  return unless vec($rfd,fileno($fh),1);
  my $buf = '';
  my $n = sysread($fh,$buf,1024*1024);
  # If we're done, make sure to send the last unfinished line
  return (1,$nonblockGetLines_last{$fh}) unless $n;
	# Prepend the last unfinished line
  $buf = $nonblockGetLines_last{$fh}.$buf;
	# And save any newly unfinished lines
  $nonblockGetLines_last{$fh} =
		(substr($buf,-1) !~ /[\r\n]/ && $buf =~ s/([^\r\n]*)$//)
			? $1 : '';
  $buf ? (0,split(/\n/,$buf)) : (0);
}

##</code><code>##

$fh = new IO::File;
open($fh,"$cmd 2>&1 |");

do {
	($eof,@lines) = nonblockGetLines($fh);
	foreach my $line ( @lines ) {
		print "Pipe saw:  [$line]\n";
	}
} until $eof;

close $fh;