xrdb - Online in the Cloud

PROGRAM:

NAME

xrdb - X server resource database utility

SYNOPSIS

xrdb [-option ...] [filename]

DESCRIPTION

Xrdb 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 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.

OPTIONS

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.

-version
This option will cause the xrdb version to be printed and the program to exit
without performing any other operations.

-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.

-undef This option is passed to the C preprocessor if used. It prevents it from
predefining any system specific macros.

-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.

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