    POSTMAP(1)                                                          POSTMAP(1)

    NAME
           postmap - Postfix lookup table management

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

    DESCRIPTION
           The  postmap(1)  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 compati-
           ble 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.

    INPUT FILE FORMAT
           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 white-
           space.

           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.

    COMMAND-LINE ARGUMENTS
           -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 table.

           -i     Incremental mode. Read entries from standard  input
                  and  do  not  truncate  an  existing  database.  By
                  default, postmap(1) creates a new database from the
                  entries in file_name.

           -N     Include  the terminating null character that termi-
                  nates  lookup  keys   and   values.   By   default,
                  postmap(1)  does  whatever  is  the default for the
                  host operating system.

           -n     Don't include the terminating null  character  that
                  terminates  lookup  keys  and  values.  By default,
                  postmap(1) 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(1)  drops
                  root  privileges  and runs as the source file owner
                  instead.

           -p     Do not inherit the file access permissions from the
                  input file when creating a new file.  Instead, cre-
                  ate a new  file  with  default  access  permissions
                  (mode 0644).

           -q key Search  the  specified  maps  for key and write the
                  first value found to 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
                  writes 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  complain  about
                  attempts to update existing entries, and make those
                  updates anyway.

           -s     Retrieve all database elements, and write one  line
                  of  key value output for each element. The elements
                  are printed in database order, which is not  neces-
                  sarily  the same as the original input order.  This
                  feature is available in  Postfix  version  2.2  and
                  later, and is not available for all database types.

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

           -w     When  updating  a  table,  do  not  complain  about
                  attempts  to  update  existing  entries, and ignore
                  those attempts.

           Arguments:

           file_type
                  The database type. To find out what types are  sup-
                  ported, use the "postconf -m" command.

                  The postmap(1) command can query any supported file
                  type, but it can create  only  the  following  file
                  types:

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

                  cdb    The  output  consists  of  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.

                  hash   The output file  is  a  hashed  file,  named
                         file_name.db.   This is available on systems
                         with support for db 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_data-
                  base_type configuration parameter.

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

    DIAGNOSTICS
           Problems are logged to the standard error  stream  and  to
           syslogd(8).    No  output  means  that  no  problems  were
           detected. Duplicate entries are skipped  and  are  flagged
           with a warning.

           postmap(1)  terminates  with  zero  exit status in case of
           success (including successful  "postmap  -q"  lookup)  and
           terminates 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
           The  following  main.cf parameters are especially relevant
           to this program.  The text below provides only a parameter
           summary.  See postconf(5) for more details including exam-
           ples.

           berkeley_db_create_buffer_size (16777216)
                  The per-table I/O buffer  size  for  programs  that
                  create Berkeley DB hash or btree tables.

           berkeley_db_read_buffer_size (131072)
                  The  per-table  I/O  buffer  size for programs that
                  read Berkeley DB hash or btree tables.

           config_directory (see 'postconf -d' output)
                  The default location of  the  Postfix  main.cf  and
                  master.cf configuration files.

           default_database_type (see 'postconf -d' output)
                  The default database type for use in newaliases(1),
                  postalias(1) and postmap(1) commands.

           syslog_facility (mail)
                  The syslog facility of Postfix logging.

           syslog_name (postfix)
                  The mail system  name  that  is  prepended  to  the
                  process  name  in  syslog  records, so that "smtpd"
                  becomes, for example, "postfix/smtpd".

    SEE ALSO
           postalias(1), create/update/query alias database
           postconf(1), supported database types
           postconf(5), configuration parameters
           syslogd(8), system logging

    README FILES
           DATABASE_README, Postfix lookup table overview

    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)