-n match only the characters a, c, g, or t they can be in upper or in lower case
-l set the minimum length of a match. The default length is 50
-b compute forward and reverse complement matches
-r only compute reverse complement matches
-c report the query-position of a reverse complement match relative to the original query sequence
-F force 4 column output format regardless of the number of reference sequence input
-L show the length of the query sequences on the header line
-d set the split size. The default value is 1
-t number of threads. The default is 1 thread
-h show possible options