sendmail, 4th Edition

dbm

Really ndbm supplied with most versions of Unix V8.1 and later

The dbm database-map type, which is really the ndbm form of database, is the traditional form of Unix database file. Data is stored in one file, keys in another. The data must fit in blocks of fixed sizes, so there is usually a limit on the maximum size (1 kilobyte or so) on any given stored piece of data. The dbm database-map type is available only if sendmail was compiled with NDBM declared (NDBM on page 125).

Many database switches are available with this dbm database-map type. All are listed in Table 23-9.

Table 23-9. The dbm database-map type K command switches

Switch	§	Description
-A	-A on page 886	Append values for duplicate keys.
-a	-a on page 887	Append tag on successful match.
-D	-D on page 887	Don’t use this database map if DeliveryMode=defer.
-f	-f on page 887	Don’t fold keys to lowercase.
-m	-m on page 888	Suppress replacement on match.
-N	-N on page 889	Append a null byte to all keys.
-O	-O on page 889	Never add a null byte.
-o	-o on page 889	The database file is optional.
-q	-q on page 889	Don’t strip quotes from key.
-S	-S on page 890	Space replacement character.
-T	-T on page 890	Suffix to append on temporary failure.
-t	-t on page 891	Ignore temporary errors.

This is the database-map type used with aliases files, if the hash type is unavailable. This type is also needed on machines that employ NIS because the underlying files for those services are stored in