Usage: bsearch [-KVvh] [--print-keys] [--no-values] [--verbose] [--help] [--block-size=integer]
   [-b integer] [--max-cache-size=integer] [-m integer] [--version] file [key ...]
-K, --print-keys                     print keys
-V, --no-values                      don't print values
-v, --verbose                        print statistics and informative messages
-h, --help                           print usage message
-b integer, --block-size=integer     block size
-m integer, --max-cache-size=integer maximum cache size