usage:  [-t <timelimit>] [-l <elementlimit>] [-o <outfile>] <infile>

       <timelimit>   limit seconds to use for scan, 0 for no limit
       <elementlmit> maximum number of elements to scan, 0 for no limit
       <outfile>     output file for the summary tree, default is
                     standard output (php://stdout)
       <infile>      input file