Provided by: elektra-bin_0.7.1-1_i386
kdb - Elektra key database command line administration tool
kdb get [-dlr] key/name
kdb set [-t type] [-d] [-c "A comment about this key"] [-m mode]
[-u uid] [-g gid] key/name "the value"
kdb set [-t type] [-m mode] [-c "A comment"] key/name -- "the value"
kdb set [-t type] [-b file] key/name
kdb ls [-lRfvs] [key/dir | key/name]
kdb ls [-lRfvx] [key/dir | key/name] > keys.xml
kdb edit [-R] [key/dir | key/name]
kdb rm key/name
kdb mv key/src key/dest
kdb ln key/src key/dest
kdb export [-f] system/some/tree.root > [file.xml]
kdb import < file.xml
kdb import file.xml
kdb monitor some/key/name Description.PP The kdb command provide ways
to manipulate the Elektra keys database.
The subcommands implemented are very similar to regular UNIX commands
like ls, and rm, specially in their output and options. Subcommands.PP
Get the value from the specified key. Accepts options: -d, -l, -f,
Set the value to the specified key. Accepts options: -c, -t, -d,
As the ls(1) command, list key names for the specified key, or
children keys, if specified a folder key. The -v argument will make
it show also the values of each key. The -d (descriptive) will make
it show the comment, key name and its value, as you are watching a
plain text file. Accepts options: -x, -d, -l, -f, -v, -R, -s
Creates a key that is a symbolic links to another key.
Move, or renames a key. Currently it can't move keys across
As the rm(1) command, removes the key specified.
A very powerful subcommand that lets you edit an XML representation
of the keys. The parameters it accepts is usually a parent key, so
its child keys will be gathered. Can be used with the -R flag to
work recursively. The editor used is the one set in the $EDITOR
environment variable, or vi. After editing the keys, kdb edit will
analyze them and commit only the changed keys, remove the keys
removed, and add the keys added. This command is only available
when /usr/lib/libelektratools.so is available.
Export a subtree of keys to XML. If no subtree is defined right
after the export command, system and current user trees will be
exported. Output is written to standard output. The output encoding
will allways be UTF-8, regardeless of your system encoding. UTF-8
is the most universal charset you can get when exchanging data
between multiple systems. Accepts -f.
Import an XML representation of keys and save it to the keys
database. If no filename is passed right after the import command,
standard input is used. This command is only available when
/usr/lib/libelektratools.so is available.
Monitor a key for some value change. It will block your command
line until a change in the key value is detected, then return its
Causes to work recursively. In ls, will list recursively.
Makes ls output an XML representation of the keys, instead of an
Causes to display long results. With ls, will generate lists
similar to ls -l. With get, will show also the key name.
Causes ls to display also inactive keys. Generate lists similar to
ls -a. Inactive keys are keys which basename begins with a '.'
(dot). An example of inactive key:
Causes to work with full key names. A full key name makes sense
only on user/* keys, and differentiate from the regular key names
in specifying the owner user. If the current user is someuser, the
user/some/key full name is user:someuser/some/key. Makes effect in
ls, export and get subcommands.
Causes get to work descriptivelly. When requesting a key it will
show the comment, key name and its value in a fancy format. Causes
set to mark the key as a directory key.
Causes get and ls to be more friendly to Shell scripts. For
example, when requesting user/env/env2/PATH, the output will be
PATH="the value", that is, only the basename of the key will be
showed and the value will be surrounded by ' " '.
When setting a key's value, you can specify the type with this
switch. Currently accepted types are string for plain text, bin for
binary as-is values, dir to create folder keys and link to create
symbolic links between keys. Plain text are always stored as
UTF-8(7) in Elektra, regardeless of your current encoding ($LANG).
If you want to force a value to be stored without the UTF-8(7)
encoding (a bad idea), you can set it as binary. Binary values
should be avoided, because they are black boxes for system
Set the key value as the content of file filename. This option is
more useful when setting binary keys.
For the set command. Will set the key access permission to mode,
which must be an octal number as for chmod(1).
Create the key with uid user ID. It can be a user name or a uid
Create the key with gid group ID. It can be a group name or a gid
When setting keys, you can use this argument to set a descriptive
comment for it. This comment is exactly as a comment in a plain
text configuration file. The comment is stored as UTF-8(7)
regardeless of your current encoding ($LANG).
With the ls subcommand, will make it show also the value stored in
With the set subcommand, everything after it will be considered the
value, even text with dashes (-).
Best Practices When Creating Keys.PP When using Elektra to store your
application's configuration and state, please keep in mind the
· You are not allowed to create keys right under system or user.
· You are not allowed to create folder keys right under system or
user. They are reserved for very essential OS subsystems.
· The keys for your application, called say MyApp, should be created
under system/sw/MyApp and/or user/sw/MyApp.
KDB_ROOT if defined, prepends it to key names.
KDB_BACKEND defines the name of another backend plugin library to use
ExamplesSetting Keys.PP bash$kdb set -c "My first key" user/example/key
"Some nice value"
bash$kdb set user:luciana/example/key -- "Some - nice - value with
bash#KDB_ROOT=user:http/sw/httpd kdb set -u nobody -g http key "Some
bash$kdb set -b image.png -t bin user/example/binaryKey
bash$kdb set -b file.txt user/example/regularKey
bash#kdb set -t link system/sw/XFree/current system/sw/XFree/handmade
Getting Keys.PP bash$KDB_ROOT=user/example kdb get some/key/name
bash$eval `kdb get -s user/env/env1/PS1`
bash$KDB_BACKEND=gconf kdb get
user/sw/gnome-terminal/global/active_encodings Listing.PP bash$kdb ls
bash$kdb ls -lR system/sw/xorg/current
bash$KDB_ROOT=system/sw kdb ls -lR xorg
bash$KDB_BACKEND=fstab kdb ls -Rv system/filesystems
bash$eval `kdb ls -Rvs user/env/env2` Miscelaneous.PP bash#kdb ln
bash#kdb mv system/sw/xorg/current system/sw/xorg/old
bash#kdb rm system/inittab/rc4
bash$KDB_BACKEND=gconf kdb rm user/gconfKey XML Import and Export.PP
bash#kdb export user/sw/app | sed -e 's|/app/|/app2/|g' | kdb import
bash#KDB_ROOT=system/sw kdb export myapp > myappconf.xml
bash#kdb import myappconf.xml
bash$KDB_BACKEND=gconf kdb export user/sw
Avi Alkalay <avi at unix.sh>
Linux Market Developer, Senior IT and Software Architect, IBM Linux
Impact Team :: ibm.com/linux
Copyright © 2004 Avi Alkalay