Usage : j-makemap options
  Joe's j-chkmail v1.12.0-070729
  Compiled on Jul 29 2007 22:44:49
        -b table : specifies table name
        -d       : dump instead of update
        -c       : count records on database
        -k key   : matching key
        -w NN    : column width when dumping database
        -t       : database type
                   currently, only btree type is supported
        -m       : how to insert records
                   e - clear database before update
                   s - skip existent records
                   u - new records update existent records
        -r       : reverse key/value order (value/key)
        -1       : single column (key only)
        -2       : two columns (key / value) - default
        -h       : help (print this and exits)
        -v       : verbose

j-makemap -d -b /var/jchkmail/wdb/j-greywhitelist.db