--hll-precision INT     Precision for HyperLogLog k-mer cardinality estimation, between 10 and 18 (default: 12)
  --exact                 Compute exact cardinality instead of estimate (slower, requires memory proportional to cardinality!)
  --quick                 Quick operation (use first hit or hits)
  --min-hits NUM          In quick op., number of hits req''d for classification
                          NOTE: this is ignored if --quick is not specified

  --unclassified-out FILENAME
                          Print unclassified sequences to filename
  --classified-out FILENAME
                          Print classified sequences to filename
  --output FILENAME       Print output to filename (default: stdout); "off" will
                          suppress normal output
  --only-classified-output
                          Print no Kraken output for unclassified sequences

  --preload               Loads DB into memory before classification
  --paired                The two filenames provided are paired-end reads
  --check-names           Ensure each pair of reads have names that agree
                          with each other; ignored if --paired is not specified
  --help                  Print this message
  --version               Print version information

Experimental:
  --uid-mapping           Map using UID database

If none of the *-input or *-compressed flags are specified, and the 
file is a regular file, automatic format detection is attempted.