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my $output = system('cleartool', 'lsco', '-r', '-brt', $stream, '-fmt' +, '%En\t%u\n');
my $output = `cleartool lsco -r -brt $stream -fmt "%En\\t%u\\n"`;
my $output = `cleartool lsco -r -brt $stream -fmt '%En\\t%u\\n'`;