    POSTMAP(1)                                             POSTMAP(1)

    NAME
           postmap - Postfix lookup table management

    SYNOPSIS
           postmap [-Nfinorvw] [-c config_dir] [-d key] [-q key]
           [file_type:]file_name ...

    DESCRIPTION
           The postmap command creates or queries one or more Postfix
           lookup  tables,  or updates an existing one. The input and
           output file formats are expected to be compatible with:

               makemap file_type file_name < file_name

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

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

           The format of a lookup table input file is as follows:

           o      A table entry has the form

                       key whitespace value

           o      Empty  lines and whitespace-only lines are ignored,
                  as are lines whose first  non-whitespace  character
                  is a `#'.

           o      A  logical  line starts with non-whitespace text. A
                  line that starts with whitespace continues a  logi-
                  cal line.

           The  key  and  value are processed as is, except that sur-
           rounding white space is stripped off. Unlike with  Postfix
           alias  databases,  quotes cannot be used to protect lookup
           keys that  contain  special  characters  such  as  `#'  or
           whitespace. The key is mapped to lowercase to make mapping
           lookups case insensitive.

           Options:

           -N     Include the terminating null character that  termi-
                  nates  lookup  keys and values. By default, Postfix
                  does whatever is the default for the host operating
                  system.

           -c config_dir
                  Read  the  main.cf  configuration file in the named
                  directory  instead  of  the  default  configuration
                  directory.

           -d key Search  the  specified  maps for key and remove one
                  entry per map.  The exit status is  zero  when  the
                  requested information was found.

                  If a key value of - is specified, the program reads
                  key values from the standard input stream. The exit
                  status  is  zero when at least one of the requested
                  keys was found.

           -f     Do not fold the lookup key to lower case while cre-
                  ating or querying a map.

           -i     Incremental  mode. Read entries from standard input
                  and  do  not  truncate  an  existing  database.  By
                  default,  postmap  creates  a new database from the
                  entries in file_name.

           -n     Don't include the terminating null  character  that
                  terminates  lookup  keys  and  values.  By default,
                  Postfix does whatever is the default for  the  host
                  operating system.

           -o     Do  not  release  root privileges when processing a
                  non-root input file. By default, postmap drops root
                  privileges  and  runs  as  the  source  file  owner
                  instead.

           -q key Search the specified maps for  key  and  print  the
                  first  value  found  on the standard output stream.
                  The exit status is zero when the requested informa-
                  tion was found.

                  If a key value of - is specified, the program reads
                  key values  from  the  standard  input  stream  and
                  prints  one  line  of key value output for each key
                  that was found. The exit status  is  zero  when  at
                  least one of the requested keys was found.

           -r     When  updating a table, do not warn about duplicate
                  entries; silently replace them.

           -v     Enable verbose logging for debugging purposes. Mul-
                  tiple  -v  options  make  the software increasingly
                  verbose.

           -w     When updating a table, do not warn about  duplicate
                  entries; silently ignore them.

           Arguments:

           file_type
                  The type of database to be produced.

                  btree  The  output  file  is  a  btree  file, named
                         file_name.db.  This  is  available  only  on
                         systems with support for db databases.

                  dbm    The  output  consists  of  two  files, named
                         file_name.pag and  file_name.dir.   This  is
                         available  only  on systems with support for
                         dbm databases.

                  hash   The output file  is  a  hashed  file,  named
                         file_name.db.   This  is  available  only on
                         systems with support for db databases.

                  Use the command postconf -m to find out what  types
                  of  database your Postfix installation can support.

                  When no file_type is specified, the  software  uses
                  the     database    type    specified    via    the
                  default_database_type configuration parameter.

           file_name
                  The name of  the  lookup  table  source  file  when
                  rebuilding a database.

    DIAGNOSTICS
           Problems and transactions are logged to the standard error
           stream. No output means no problems. Duplicate entries are
           skipped and are flagged with a warning.

           postmap  terminates  with zero exit status in case of suc-
           cess (including successful postmap -q lookup)  and  termi-
           nates with non-zero exit status in case of failure.

    ENVIRONMENT
           MAIL_CONFIG
                  Directory with Postfix configuration files.

           MAIL_VERBOSE
                  Enable verbose logging for debugging purposes.

    CONFIGURATION PARAMETERS
           default_database_type
                  Default  output  database  type.  On many UNIX sys-
                  tems, the default database type is either  hash  or
                  dbm.

           berkeley_db_create_buffer_size
                  Amount  of buffer memory to be used when creating a
                  Berkeley DB hash or btree lookup table.

           berkeley_db_read_buffer_size
                  Amount of buffer memory to be used when  reading  a
                  Berkeley DB hash or btree lookup table.

    LICENSE
           The  Secure  Mailer  license must be distributed with this
           software.

    AUTHOR(S)
           Wietse Venema
           IBM T.J. Watson Research
           P.O. Box 704
           Yorktown Heights, NY 10598, USA

                                                           POSTMAP(1)