map_db - read a FASTA (0), GENBANK flat file (1) PIR/VMS (5) or GCG binary (6) sequence database and

       Bill Pearson
       wrp@virginia.EDUMAP_DB(September, 1999)

map_dbfilename reads the sequence database in filename and produce a  new  file  filename.xin  with  the
       offset information necessary for efficient memory mapping.

       The  programs  in  fasta version 32t08 can use memory mapped i/o to load sequence database files and read
       them efficiently.  Memory mapping is used only if a ".xin" file is available.  The ".xin" file is created
       by map_db.

       In addition to map_db, list_db is available to display  the  database  size,  etc,  and  set  of  offsets
       calculated by map_db.

map_db  -  read  a  FASTA  (0), GENBANK flat file (1) PIR/VMS (5) or GCG binary (6) sequence database and
       produce the offsets necessary for efficient memory mapping.

       -n     Read file as DNA database.

map_db [-n] filename | "filename libtype"