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select(STDERR);$|=1;select(STDOUT);$|=1;   # autoflush
print "This is the prompt: ";
my $input = <STDIN>;
print "done.\n";

select(STDERR);$|=1;select(STDOUT);$|=1;   # autoflush
$cmd = 'perl b.pl 2>&1';
system($cmd);

select(STDERR);$|=1;select(STDOUT);$|=1;   # autoflush
$cmd = 'perl b.pl 2>&1 |';
open(CMD, $cmd) or die "error: open '$cmd': $!\n";
while (<CMD>) { print }  # and print to log file here too
close(CMD);

select(STDERR);$|=1;select(STDOUT);$|=1;   # autoflush
$cmd = 'perl b.pl 2>&1 | tee -a logfile.txt';
system($cmd);