GDB can style its output on a capable terminal. This is enabled by default on most systems, but disabled by default when in batch mode (see Mode Options). Various style settings are available; and styles can also be disabled entirely.
set style enabled ‘on|off’
Enable or disable all styling. The default is host-dependent, with most hosts defaulting to ‘on’.
show style enabled
Show the current state of styling.
set style sources ‘on|off’
Enable or disable source code styling. This affects whether source
code, such as the output of the
list command, is styled. The
default is ‘on’. Note that source styling only works if styling
in general is enabled, and if a source highlighting library is
available to GDB.
There are two ways that highlighting can be done. First, if GDB was linked with the GNU Source Highlight library, then it is used. Otherwise, if GDB was configured with Python scripting support, and if the Python Pygments package is available, then it will be used.
show style sources
Show the current state of source code styling.
set style control specific forms of styling.
These subcommands all follow the same pattern: each style-able object
can be styled with a foreground color, a background color, and an
For example, the style of file names can be controlled using the
set style filename group of commands:
set style filename background color
Set the background to color. Valid colors are ‘none’ (meaning the terminal’s default color), ‘black’, ‘red’, ‘green’, ‘yellow’, ‘blue’, ‘magenta’, ‘cyan’, and‘white’.
set style filename foreground color
Set the foreground to color. Valid colors are ‘none’ (meaning the terminal’s default color), ‘black’, ‘red’, ‘green’, ‘yellow’, ‘blue’, ‘magenta’, ‘cyan’, and‘white’.
set style filename intensity value
Set the intensity to value. Valid intensities are ‘normal’ (the default), ‘bold’, and ‘dim’.
show style command and its subcommands are styling
a style name in their output using its own style.
show style to see the complete list of styles,
their characteristics and the visual aspect of each style.
The style-able objects are:
Control the styling of file names. By default, this style’s foreground color is green.
Control the styling of function names. These are managed with the
set style function family of commands. By default, this
style’s foreground color is yellow.
Control the styling of variable names. These are managed with the
set style variable family of commands. By default, this style’s
foreground color is cyan.
Control the styling of addresses. These are managed with the
set style address family of commands. By default, this style’s
foreground color is blue.
Control the styling of GDB’s version number text. By
default, this style’s foreground color is magenta and it has bold
intensity. The version number is displayed in two places, the output
show version, and when GDB starts up.
In order to control how GDB styles the version number at
startup, add the
set style version family of commands to the
early initialization command file (see Initialization Files).
Control the styling of titles. These are managed with the
set style title family of commands. By default, this style’s
intensity is bold. Commands are using the title style to improve
the readability of large output. For example, the commands
help are using the title style
for the command names.
Control the styling of highlightings. These are managed with the
set style highlight family of commands. By default, this style’s
foreground color is red. Commands are using the highlight style to draw
the user attention to some specific parts of their output. For example,
apropos -v REGEXP uses the highlight style to
mark the documentation parts matching regexp.
Control the styling of the TUI border. Note that, unlike other
styling options, only the color of the border can be controlled via
set style. This was done for compatibility reasons, as TUI
controls to set the border’s intensity predated the addition of
general styling to GDB. See TUI Configuration.
Control the styling of the active TUI border; that is, the TUI window that has the focus.