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       makedat - create GDBM/DB files for maildrop


       makedat {-src=textfile} {-tmp=tmpfile} {-file=gdbmfile} [-cidr]


       The gdbm family of functions in maildrop provides access to GDBM/DB
       databases - simple database files. The gdbm family of functions provide
       a way of quickly storing and looking up key/data pairs.

       You can use any program to create GDBM/DB database files.  makedat is a
       quick utility to create GDBM or DB files from plain text files.

       The system administrator selects whether maildrop uses GDBM or DB
       database files and whether makedat creates GDBM or DB database files as

       The makedat command may not be available to you. GDBM/DB support in
       maildrop is optional, and the system administrator may choose not to
       install GDBM/DB support and the makedat command.

       To see whether GDBM or DB support is being used, run the command
       "maildrop -v".

       The textfile argument to makedat is a plain text file containing
       key/value pairs. Each line in the text file contains a key value,
       followed by a tab and a data value. The data value may be omitted,
       which defaults to "1". For example, the following three lines:




       Three key/value pairs are created:, value "1";,
       value "ok", and "", value "bad".

       Empty lines in textfile, and lines starting with the # character, are

       textfile can be "-", in which case standard input is used.

       gdbmfile is the GDBM/DB file to create. If this file exists, its
       existing contents are replaced.

       tmpfile is a name of a temporary file in the same directory as
       gdbmfile.  tmpfile is used by makedat to create the GDBM file, then
       tmpfile is renamed to gdbmfile.

       This approach foregoes any need for locking in order to be able to
       dynamically update GDBM/DB files used by maildrop´s gdbm functions.
       However, makedat does not use any locks on tmpfile, so multiple
       instances of makedat using the same tmpfile are prohibited.

       The -cidr flag specifies that the key is an IP netblock in CIDR
       notation. This flag requires the Net::CIDR Perl module to be installed
       separately. Download Net::CIDR from


       There are historical reasons why database functions in maildrop are
       called gdbm functions. The initial implementation used GDBM functions
       exclusively. The ability to use the DB library instead of the GDBM
       library has been added later.


           makedat blacklist /etc/mail/blacklist.tmp /etc/mail/blacklist.dat

       Takes blacklist, and creates /etc/mail/blacklist.dat, using
       /etc/mail/blacklist.tmp as a temporary file.


       maildrop(1)[1], maildropgdbm(5)[2].


        1. maildrop(1)
           [set $man.base.url.for.relative.links]/maildrop.html

        2. maildropgdbm(5)
           [set $man.base.url.for.relative.links]/maildropgdbm.html