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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 their 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
       processes.

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)