postalias

postalias - Postfix alias database maintenance

Beschreibung

The postalias(1) command creates or queries one or more Postfix alias databases, or updates an existing one. The input and output file formats are expected to be compatible with Sendmail version 8, and are expected to be suitable for the use as NIS alias maps.

If the result files do not exist they will be created with the same group and other read permissions as their source file.

While a database update is in progress, signal delivery is postponed, and an exclusive, advisory, lock is placed on the entire database, in order to avoid surprises in spectator processes.

The format of Postfix alias input files is described in aliases(5).

By default the lookup key is mapped to lowercase to make the lookups case insensitive; as of Postfix 2.3 this case folding happens only with tables whose lookup keys are fixed-case strings such as btree:, dbm: or hash:. With earlier versions, the lookup key is folded even with tables where a lookup field can match both upper and lower case text, such as regexp: and pcre:. This resulted in loss of information with $number substitutions.

Syntax

postalias [-Nfinoprsuvw] [-c config_dir] [-d key] [-q key] [file_type:]file_name ...

Parameter

Option	Beschreibung
file_type	The database type. To find out what types are supported, use the "postconf -m" command. The postalias(1) command can query any supported file type, but it can create only the following file types:
btree	The output is a btree file, named file_name.db. This is available on systems with support for db databases.
cdb	The output is one file named file_name.cdb. This is available on systems with support for cdb databases.
dbm	The output consists of two files, named file_name.pag and file_name.dir. This is available on systems with support for dbm databases.
fail	A table that reliably fails all requests. The lookup table name is used for logging only. This table exists to simplify Postfix error tests.
hash	The output is a hashed file, named file_name.db. This is available on systems with support for db databases.
lmdb	The output is a btree-based file, named file_name.lmdb. lmdb supports concurrent writes and reads from different processes, unlike other supported file-based tables. This is available on systems with support for lmdb databases.
sdbm	The output consists of two files, named file_name.pag and file_name.dir. This is available on systems with support for sdbm databases.When no file_type is specified, the software uses the database type specified via the default_database_type configuration parameter. The default value for this parameter depends on the host environment.
file_name	The name of the alias database source file when creating a database.

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