Most X clients use the RESOURCE_MANAGER and SCREEN_RESOURCES properties to get user preferences about color, 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 machine 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 filename is given) is optionally passed through the C preprocessor with the following symbols defined, based on the capabilities of the server being used:

SERVERHOST=hostname

the hostname portion of the display to which you are connected.

SRVR_name

the SERVERHOST hostname string turned into a legal identifier. For example, "my-dpy.lcs.mit.edu" becomes SRVR_my_dpy_lcs_mit_edu.

HOST=hostname

the same as SERVERHOST.

DISPLAY_NUM=num

the number of the display on the server host.

CLIENTHOST=hostname

the name of the host on which xrdb is running.

CLNT_name

the CLIENTHOST hostname string turned into a legal identifier. For example, "expo.lcs.mit.edu" becomes CLNT_expo_lcs_mit_edu.

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 literal specifying the vendor of the server.

VNDR_name

the VENDOR name string turned into a legal identifier. For example, "MIT X Consortium" becomes VNDR_MIT_X_Consortium.

EXT_name

A symbol is defined for each protocol extension supported by the server. Each extension string name is turned into a legal identifier. For example, "X3D-PEX" becomes EXT_X3D_PEX.

NUM_SCREENS=num

the total number of screens.

SCREEN_NUM=num

the number of the current screen (from zero).

BITS_PER_RGB=num

the number of significant bits in an 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.

CLASS_visualclass=visualid

the visual class of the root window in a form you can #ifdef on. The value is the numeric id of the visual.

COLOR

defined only if CLASS is one of StaticColor, PseudoColor, TrueColor, or DirectColor.

CLASS_visualclass_depth=num

A symbol is defined for each visual supported for the screen. The symbol includes the class of the visual and its depth; the value is the numeric id of the visual. (If more than one visual has the same class and depth, the numeric id of the first one reported by the server is used.)

HEIGHT=num

the height of the root window in pixels.

WIDTH=num

the width of the root window in pixels.

PLANES=num

the number of bit planes (the depth) of the root window.

X_RESOLUTION=num

the x resolution of the screen in pixels per meter.

Y_RESOLUTION=num

the y resolution of the screen in pixels per meter.

SRVR_name, CLNT_name, VNDR_name, and EXT_name identifiers are formed by changing all characters other than letters and digits into underscores (_).

Lines that begin with an exclamation mark (!) are ignored and may be used as comments.

Note that since xrdb 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.  

xrdb program accepts the following options:

-help

This option (or any unsupported option) will cause a brief description of the allowable options and parameters to be printed.

-display display

This option specifies the X server to be used; see X(7). 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.

-all

This option indicates that operation should be performed 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, -override and -merge, the input file is processed once for each screen. The resources which 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.

-global

This option indicates that the operation should only be performed on the screen-independent RESOURCE_MANAGER property.

-screen

This option indicates that the operation should only be performed on the SCREEN_RESOURCES property of the default screen of the display.

-screens

This option indicates that the operation should be performed on the SCREEN_RESOURCES property of each screen of the display. For -load, -override and -merge, the input file is processed for each screen.

-n

This option indicates that changes to the specified properties (when used with -load, -override or -merge) or to the resource file (when used with -edit) should be shown on the standard output, but should not be performed.

-quiet

This option indicates that warning about duplicate entries should not be displayed.

-cpp filename

This option specifies the pathname of the C preprocessor program to be used. Although xrdb was designed to use CPP, any program that acts as a filter and accepts the -D, -I, and -U options may be used.

-nocpp

This option indicates that xrdb should not run the input file through a preprocessor before loading it into properties.

-symbols

This option indicates that the symbols that are defined for the preprocessor should be printed onto the standard output.

-query

This option indicates that the current contents of the specified properties should be printed onto the standard output. Note that since preprocessor commands in the input resource file are part of the input file, not part of the property, they won't 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.

-load

This option indicates that the input should be loaded as the new value of the specified properties, replacing whatever was there (i.e. the old contents are removed). This is the default action.

-override

This option indicates that the input should be added to, instead of replacing, the current contents of the specified properties. New entries override previous entries.

-merge

This option indicates that the input should be merged and lexicographically sorted with, instead of replacing, the current contents of the specified properties.

-remove

This option indicates that the specified properties should be removed from the server.

-retain

This option indicates that the server should be instructed not to reset if xrdb is the first client. This should never be necessary under normal conditions, since xdm and xinit always act as the first client.

-edit filename

This option indicates that the contents of the specified properties should be edited 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.

-backup string

This option specifies a suffix to be appended to the filename used with -edit to generate a backup file.

-Dname[=value]

This option is passed through to the preprocessor and is used to define symbols for use with conditionals such as #ifdef.

-Uname

This option is passed through to the preprocessor and is used to remove any definitions of this symbol.

-Idirectory

This option is passed through to the preprocessor and is used to specify a directory to search for files that are referenced with #include.

DISPLAY

to figure out which display to use.

The default for no arguments should be to query, not to overwrite, so that it is consistent with other programs.  

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