gdbmtool man page on Manjaro

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GDBM_DUMP(1)		      GDBM User Reference		  GDBM_DUMP(1)

       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]

       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	 stan‐
       dard  input,  executes them and prints the results on the standard out‐
       put.  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.

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

       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 char‐
       acter effectively removes that character, allowing to split long	 argu‐
       ments 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, e FILE-NAME [truncate] [binary|ascii]
	      Export the database to the flat file FILE-NAME.  This is equiva‐
	      lent to gdbm_dump(1).

	      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.

       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

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

	      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 com‐
       mand terminator, so each declaration can appear on a separate line  and
       arbitrary  number  of  comments can be inserted to document the defini‐

       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 for‐
       mat 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 sim‐
       plified 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	inter‐
       preted to contain all bytes up to the end of the datum.

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

       ps1, string
	      Primary  prompt string.  Its value can contain conversion speci‐
	      fiers, consisting of the % character followed by another charac‐
	      ter.   These  specifiers are expanded in the resulting prompt as

		      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

	      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.

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

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

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

       Report bugs to <>.

       Copyright © 2013 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.

GDBM				 May 17, 2013			  GDBM_DUMP(1)

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