The xrdb(1) utility is used to get or set the contents of
the RESOURCE_MANAGER property on the root window of screen 0, or
the SCREEN_RESOURCES property on the root window of any or all
screens, or everything combined. You would normally run this
program from your X startup file.
Most X clients use the RESOURCE_MANAGER and SCREEN_RESOURCES
properties to get user preferences about such things as colors,
fonts, and so on for applications. Having this information in the
server (where it is available to all clients) instead of on disk
solves the problem in previous versions of X that required you to
maintain defaults files on every computer that you might
use. It also allows for dynamic changing of defaults without
editing files.
The RESOURCE_MANAGER property is used for resources that apply
to all screens of the display. The SCREEN_RESOURCES property on
each screen specifies additional (or overriding) resources to be
used for that screen. (When there is only one screen,
SCREEN_RESOURCES is normally not used, all resources are just
placed in the RESOURCE_MANAGER property.)
The file specified by filename (or the contents from
standard input if - or no file name is given) is optionally
passed through the C preprocessor with the following symbols
defined, based on the capabilities of the server being used:
BITS_PER_RGB=num
The number of significant bits in an red-green-blue (RGB) color
specification. This is the log base 2 of the number of distinct
shades of each primary that the hardware can generate. Note that it
usually is not related to PLANES.
CLASS=visualclass
One of StaticGray, GrayScale, StaticColor, PseudoColor,
TrueColor, DirectColor. This is the visual class of the root window
of the default screen.
COLOR
Defined only if CLASS is one of StaticColor, PseudoColor,
TrueColor, or DirectColor.
HEIGHT=num
The height of the default screen in pixels.
SERVERHOST=hostname
The host-name portion of the display to which you are
connected.
HOST=hostname
The same as SERVERHOST.
CLIENTHOST=hostname
The name of the host on which xrdb(1) is running.
PLANES=num
The number of bit planes (the depth) of the root window of the
default screen.
RELEASE=num
The vendor release number for the server. The interpretation of
this number will vary depending on VENDOR.
REVISION=num
The X protocol minor version supported by this server
(currently 0).
VERSION=num
The X protocol major version supported by this server (should
always be 11).
VENDOR=vendor
A string specifying the vendor of the server.
WIDTH=num
The width of the default screen in pixels.
X_RESOLUTION=num
The x resolution of the default screen in pixels per
meter.
Y_RESOLUTION=num
The y resolution of the default screen in pixels per
meter.
Lines that begin with an exclamation mark (!) are ignored
and can be used as comments.
Note that since xrdb(1) can read from standard input, it
can be used to the change the contents of properties directly from
a terminal or from a shell script.
The xrdb(1) program accepts the following options:
-all
Perform the operation on the screen-independent resource
property (RESOURCE_MANAGER), as well as the screen-specific
property (SCREEN_RESOURCES) on every screen of the display. For
example, when used in conjunction with -query, the contents
of all properties are output. For -load and -merge,
the input file is processed once for each screen. The resources
that occur in common in the output for every screen are collected,
and these are applied as the screen-independent resources. The
remaining resources are applied for each individual per-screen
property. This the default mode of operation.
-backupstring
Generate a backup file with -edit, using string
as a suffix appended to the file name used with -edit.
-cppfilename
Use filename as the C preprocessor program( CPP) to be
used. Although xrdb(1) was designed to use CPP, any program
that acts as a filter and accepts the -D, -I, and
-U options can be used.
-Dname[=value]
Define symbols for use with conditionals such as #ifdef;
this option is passed through to the preprocessor.
-displaydisplay
Use the X server specified by display; X(5). It
also specifies the screen to use for the -screen option, and
it specifies the screen from which preprocessor symbols are derived
for the -global option.
-editfilename
Edit the contents of the specified properties into the given
file, replacing any values already listed there. This allows you to
put changes that you have made to your defaults back into your
resource file, preserving any comments or preprocessor lines.
-global
Perform the operation only on the screen-independent
RESOURCE_MANAGER property.
-help
Print a brief description of the allowable options and
parameters to be printed; any unsupported option causes the message
to be printed.
-load
Load the input as the new value of the specified properties,
replacing whatever was there (that is, removing the old contents).
This is the default action.
-merge
Instead of replacing the current contents of the specified
properties, merge the input with it. This option does a
lexicographic sorted merge of the two inputs, which is almost
certainly not what you want, but remains for backward
compatibility.
-n
Display the result of the command without really doing it.
Changes to the specified properties (when used with -load or
-merge) or to the resource file (when used with
-edit) are shown on the standard output but not
performed.
-nocpp
Do not run the input file through a preprocessor before loading
it into properties.
-query
Print the current contents of the specified properties onto
standard output. Since preprocessor commands in the input resource
file are part of the input file, not part of the property, they
will not appear in the output from this option. The -edit
option can be used to merge the contents of properties back into
the input resource file without damaging preprocessor
commands.
-quiet
Do not display warnings about duplicate entries.
-remove
Remove the specified properties from the server.
-retain
Do not reset the server if xrdb(1) is the first client.
This should never be necessary under normal conditions, since
xdm(1) and xinit(1) always act as the first
client.
-screen
Perform the operation only on the SCREEN_RESOURCES property of
the default screen of the display.
-screens
Perform the operation only on the SCREEN_RESOURCES property of
each screen of the display. For -load and -merge, the
input file is processed for each screen.
-symbols
Print onto the standard output the symbols that are defined for
the preprocessor.