| -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.
 |