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       userdb - manipulate /etc/courier/userdb


       userdb {addr} set {field=value...}

       userdb {addr} unset {field...}

       userdb {addr} del

       userdb {path/addr} [set | unset | del] ...

       userdb -f {file} {adr} [set | unset | del] ...

       userdb -show {path}

       userdb -show {path} {addr}

       userdb -show -f {file}

       userdb -show -f {file} {addr}


       userdb is a convenient script to individually manipulate entries in
       /etc/courier/userdb. See makeuserdb(8)[1] for a description of its
       contents.  /etc/courier/userdb can always be edited using any text
       editor, but userdb is a convenient way to modify this file from another

       /etc/courier/userdb can also be a subdirectory, instead of a file.
       Specify foo/bar/addr to manipulate addr in the file
       /etc/courier/userdb/foo/bar. You can also use the -f flag: -f
       /etc/courier/userdb/foo/bar is equivalent. Use whatever form makes the
       most sense to you.

       /etc/courier/userdb must not have any group or world permissions.
       That´s because its contents may include system passwords (depending
       upon the application which uses this virtual user account database).

       Each line in /etc/courier/userdb takes following form:

       addr specifies a unique virtual address. It is followed by a single tab
       character, then a list of field=value pairs, separated by vertical
       slash characters. See makeuserdb(8)[1] for field definitions.

       A text editor can be used to add blank lines or comments in
       /etc/courier/userdb. Any blank lines or comments are ignored by the
       userdb script.

       The names of the actual fields, and their contents, are defined
       entirely by applications that use the /etc/courier/userdb database, the
       userdb command just adds or removes arbitrary fields.

       For example:

           userdb default/info set mail=/home/mail/info

       This command accesses the address "info" in

       If the second argument to userdb is "set", the remaining arguments are
       taken as field=value pairs, which are added to the record for addr. If
       there is no record for addr, a new record will be appended to the file.
       If addr exists, any existing values of any specified fields are
       removed. If =value is missing, userdb stops and prompts for it. This is
       useful if you´re setting a password field, where you do not want to
       specify the password on the command line, which can be seen by the
       ps(1) command. If userdb is being executed by a script, the value can
       be provided on standard input.

       Use "unset" to delete fields from an existing record. Use "del" to
       delete all fields in the existing record, plus the record itself.

   DISPLAYING /etc/courier/userdb
       If the first argument to userdb is -show, userdb displays the contents
       of /etc/courier/userdb. If /etc/courier/userdb is a subdirectory, path
       must refer to a specific file in /etc/courier/userdb. The -f option can
       be used instead of path in order to specify an arbitrary file.

       If addr is not specified, userdb produces a list, on standard output,
       containing all addresses found in the file, on per line. If addr is
       specified, userdb produces a list, on standard output, of all the
       fields in /etc/courier/userdb for this addr.

   REBUILDING /etc/courier/userdb.dat
       The actual virtual account/address database is /etc/courier/userdb.dat.
       This is a binary database file.  /etc/courier/userdb is the plain text
       version. After running userdb, execute the makeuserdb(8)[1] command to
       rebuild /etc/courier/userdb.dat for the changes to take effect.


       addr must be unique. If /etc/courier/userdb is a subdirectory, it´s
       possible to create the same addr in different files in the
       subdirectory. This is an error that is not currently detected by
       userdb, however the subsequent makeuserdb(8)[1] command will fail with
       an error message.


        /etc/courier/userdb - plain text file, or directory of plain text

        .lock.filename - lock file for filename

        .tmp.filename - temporary file used to create new contents of filename


       makeuserdb(8)[1], userdbpw(8)[2]


        1. makeuserdb(8)

        2. userdbpw(8)