Provided by: gdbmtool_1.18.1-5_amd64 bug


       gdbmtool - examine and modify a GDBM database


       gdbmtool  [-lmNnqrs] [-b SIZE] [-c SIZE] [-f FILE] [--block-size=SIZE] [--cache-size=SIZE]
       [--file  FILE]  [--newdb]  [--no-lock]  [--no-mmap]   [--norc]   [--quiet]   [--read-only]
       [--synchronize] [DBFILE] [COMMAND [; COMMAND...]]

       gdbmtool [-Vh] [--help] [--usage] [--version]


       The  gdbmtool utility allows you to view and modify an existing GDBM database or to create
       a new one.

       The DBFILE argument supplies the name of the database  to  open.   If  not  supplied,  the
       default  name junk.gdbm is used instead.  If the named database does not exist, it will be
       created.  An existing database can be cleared (i.e. all records removed from it) using the
       --newdb option (see below).

       Unless  the  -N  (--norc)  option  is  given,  after startup gdbmtool looks for file named
       .gdbmtoolrc first in the current working directory, and, if not found there, in  the  home
       directory  of  the  user  who  started  the  program.   If  found,  this  file is read and
       interpreted as a list of gdbmtool commands.

       Then gdbmtool starts a loop, in which it reads commands from the standard input,  executes
       them  and prints the results on the standard output.  If the standard input is attached to
       a console, the program runs in interactive mode.

       The program terminates when the quit command is given, or end-of-file is detected  on  its
       standard input.

       Commands  can  also  be  specified in the command line, after the DBFILE argument. In this
       case, they will be interpreted without attempting to read more commands from the  standard

       If  several  commands are supplied, they must be separated by semicolons (properly escaped
       or quoted, in order to prevent them from being interpreted by the shell).

       A gdbmtool command consists of  a  command  verb,  optionally  followed  by  one  or  more
       arguments,  separated  by any amount of white space.  A command verb can be entered either
       in full or in an abbreviated form, as long as that abbreviation does not match  any  other

       Any  sequence  of  non-whitespace  characters  appearing  after  the command verb forms an
       argument.  If the argument contains  whitespace  or  unprintable  characters  it  must  be
       enclosed  in  double  quotes.   Within  double  quotes  the  usual  escape  sequences  are
       understood, as shown in the table below:

               Escape      Expansion
               \a          Audible bell character (ASCII 7)
               \b          Backspace character (ASCII 8)
               \f          Form-feed character (ASCII 12)
               \n          Newline character (ASCII 10)
               \r          Carriage return character (ASCII 13)
               \t          Horizontal tabulation character (ASCII 9)
               \v          Vertical tabulation character (ASCII 11)
               \\          Single slash

       In addition, a backslash immediately followed by  the  end-of-line  character  effectively
       removes that character, allowing to split long arguments over several input lines.


       -b, --block-size=SIZE
              Set block size.

       -c, --cache-size=SIZE
              Set cache size.

       -f, --file=FILE
              Read commands from FILE, instead of from the standard input.

       -l, --no-lock
              Disable file locking.

       -m, --no-mmap
              Do not use mmap(2).

       -n, --newdb
              Create the database, truncating it if it already exists.

       -q, --quiet
              Don't print initial banner.

       -r, --read-only
              Open database in read-only mode.

       -s, --synchronize
              Synchronize to disk after each write.

       -h, --help
              Print a short usage summary.

              Print a list of available options.

       -V, --version
              Print program version


       avail  Print the avail list.

       bucket NUM
              Print the bucket number NUM and set is as the current one.

       cache  Print the bucket cache.

       close  Close the currently open database.

       count  Print the number of entries in the database.

              Print the current bucket.

       delete KEY
              Delete record with the given KEY.

       dir    Print hash directory.

       export FILE-NAME [truncate] [binary|ascii]
              Export   the   database  to  the  flat  file  FILE-NAME.   This  is  equivalent  to

              This command will not overwrite an existing file, unless the truncate parameter  is
              also given.  Another optional parameter determines the type of the dump (*note Flat
              files::).  By default, ASCII dump will be created.

       fetch KEY
              Fetch and display the record with the given KEY.

       first  Fetch and display the first record in the  database.   Subsequent  records  can  be
              fetched using the next command (see below).

       hash KEY
              Compute and display the hash value for the given KEY.

       header Print file header.

       help or ?
              Print  a  concise  command  summary,  showing each command letter and verb with its
              parameters and a short  description  of  what  it  does.   Optional  arguments  are
              enclosed in square brackets.

              Shows  the  command history list with line numbers.  This command is available only
              if the program was compiled with GNU Readline.

       history COUNT.
              Shows COUNT latest commands from the command history.

       history N COUNT.
              Shows COUNT commands from the command history starting with Nth command.

       import FILE-NAME [replace] [nometa]
              Import data from a flat dump file FILE-NAME.  If the replace argument is given, any
              records  with  the  same  keys as the already existing ones will replace them.  The
              nometa argument turns off restoring meta-information from the dump file.

       list   List the contents of the database.

       next [KEY]
              Sequential access: fetch and display the next record.  If the  KEY  is  given,  the
              record following the one with this key will be fetched.

       open FILE
              Open  the  database  file  FILE.   If  successful,  any previously open database is
              closed.  Otherwise, if the operation fails, the currently opened  database  remains

              This  command takes additional information from the variables open, lock, mmap, and
              sync.  See the section VARIABLES, for a detailed description of these.

       quit   Close the database and quit the utility.

              Reorganize the database.

       set [VAR=VALUE...]
              Without arguments, lists variables and their values.  If arguments  are  specified,
              sets  variables.    Boolean  variables  can  be  set  by  specifying variable name,
              optionally prefixed with no, to set it to false.

       source FILE
              Read commands from the given FILE.

       status Print current program status.

       store KEY DATA
              Store the DATA with the given KEY in the database.  If the KEY already exists,  its
              data will be replaced.

       unset VARIABLE...
              Unsets listed variables.

              Print the version of gdbm.


       The  define  statement provides a mechanism for defining key or content structures.  It is
       similar to the C struct declaration:

           define key|content { defnlist }

       The defnlist is a comma-separated  list  of  member  declarations.   Within  defnlist  the
       newline  character  looses  its  special  meaning  as  the  command  terminator,  so  each
       declaration can appear on a separate line and arbitrary number of comments can be inserted
       to document the definition.

       Each declaration has one of the following formats

           type name
           type name [N]

       where  type  is  a  data  type and name is the member name.  The second format defines the
       member name as an array of N elements of type.

       The supported types are:

               type        meaning
               char        single byte (signed)
               short       signed short integer
               ushort      unsigned short integer
               int         signed integer
               unsigned    unsigned integer
               uint        ditto
               long        signed long integer
               ulong       unsigned long integer
               llong       signed long long integer
               ullong      unsigned long long integer
               float       a floating point number
               double      double-precision floating point number
               string      array of characters (see the NOTE below)
               stringz     null-terminated string of characters

       The following alignment declarations can be used within defnlist:

       offset N
              The next member begins at offset N.

       pad N  Add N bytes of padding to the previous member.

       For example:

           define content {
                   int status,
                   pad 8,
                   char id[3],
                   stringz name

       To define data consisting of a single data member, the following simplified construct  can
       be used:

           define key|content type

       where type is one of the types discussed above.

       NOTE:  The string type can reasonably be used only if it is the last or the only member of
       the data structure.  That's because  it  provides  no  information  about  the  number  of
       elements  in  the  array,  so  it is interpreted to contain all bytes up to the end of the


       confirm, boolean
              Whether to ask for confirmation before  certain  destructive  operations,  such  as
              truncating the existing database.  Default is true.

       ps1, string
              Primary  prompt string.  Its value can contain conversion specifiers, consisting of
              the % character followed by another character.  These specifiers  are  expanded  in
              the resulting prompt as follows:

                      Sequence    Expansion
                      %f          name of the db file
                      %p          program name
                      %P          package name (gdbm)
                      %_          horizontal space (ASCII 32)
                      %v          program version
                      %%          %

              The default prompt is %p>%_.

       ps2, string
              Secondary  prompt.   See  ps1  for  a  description  of  its  value.  This prompt is
              displayed before reading the second and subsequent lines of a multi-line command.

              The default value is %_>%_.

       delim1, string
              A string used to delimit fields of a structured datum on output  (see  the  section
              DATA DEFINITIONS).

              Default is , (a comma).  This variable cannot be unset.

       delim2, string
              A string used to delimit array items when printing a structured datum.

              Default is , (a comma).  This variable cannot be unset.

       pager, string
              The  name and command line of the pager program to pipe output to.  This program is
              used in interactive mode when the estimated number of output lines is greater  then
              the number of lines on your screen.

              The default value is inherited from the environment variable PAGER.  Unsetting this
              variable disables paging.

       quiet, boolean
              Whether to display welcome banner at startup.  This variable should  be  set  in  a
              startup script file.

       The following variables control how the database is opened:

       cachesize, numeric
              Sets the cache size.  By default this variable is not set.

       blocksize, numeric
              Sets the block size.  Unset by default.

       open, string
              Open mode.  The following values are allowed:

              newdb  Truncate  the  database  if it exists or create a new one.  Open it in read-
                     write mode.

              wrcreat or rw
                     Open the database in read-write mode.  Create it if it does not exist.  This
                     is the default.

              reader or readonly
                     Open the database in read-only mode.  Signal an error if it does not exist.

       filemode, octal
              Sets the file mode for newly created database files. Default is 0644.

       lock, boolean
              Lock the database.  This is the default.

       mmap, boolean
              Use memory mapping.  This is the default.

       coalesce, boolean
              When  set,  this  option  causes adjacent free blocks to be merged which allows for
              more efficient memory management at the expense of a certain increase in CPU usage.

       centfree, boolean
              Enables central free block pool. This causes all free blocks of space to be  placed
              in the global pool, thereby speeding up the allocation of data space.


       gdbm_dump(1), gdbm_load(1), gdbm(3).


       Report bugs to <>.


       Copyright © 2013-2018 Free Software Foundation, Inc
       License GPLv3+: GNU GPL version 3 or later <>
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY,
       to the extent permitted by law.