| -c CacheSize | Specifies to use the hash and B-tree cache size. | 
| -C | Indicates to use the specified sendmail configuration file for
looking up the TrustedUser option. | 
| -d | Allows duplicate keys in the map. This is only allowed on B-Tree
format maps. If two identical keys are read, they are both inserted
into the map. | 
| -e | Allows empty values, right hand side. | 
| -f | Disables the function of folding all upper case letters in the key to
lowercase. This is intended to mesh with the -f flag in the
K line in the sendmail.cf file. The value
is never case folded. | 
| -l | Lists supported map types. | 
| -N | Includes the Null byte that terminates strings in the map. This
must match the -N flag in the sendmail.cf "K" line. | 
| -o | Specifies to append to an existing file. This allows you to
augment an existing file. | 
| -r | Allows replacement of existing keys. Normally, the
makemap command complains if you repeat a key and does not perform
the insert. | 
| -s | Iignores safety checks on maps being created. This includes
checking for hard or symbolic links in world writeable directories. | 
| -u | Dumps, unmaps, the contents of the database to standard output. | 
| -v | Specifies that the command verbosely print its status. |