fbhelp [-F framebuffer]FBHELP(1)
NAME
fbhelp - describe how to select a frame buffer and list available devices
On this page
SYNOPSIS
DESCRIPTION
fbhelp explains how to select a frame buffer display device, lists every frame buffer interface compiled into the libdm(3) library, then opens the selected device and prints its device-specific help.
The device is chosen first from the -F framebuffer option if given, otherwise from the FB_FILE environment variable, and finally from the built-in default for the system. Most BRL-CAD frame buffer tools, such as fb-pix(1) and pix-fb(1), accept the same -F convention.
OPTIONS
- -F framebuffer
-
Specify the frame buffer device to describe rather than using FB_FILE or the system default.
- -h
-
Print a usage message. -? is accepted as a synonym.
EXAMPLES
Example 1. List the available frame buffer devices
fbhelpPrints the FB_FILE selection instructions, the list of frame buffer interfaces built into this installation (for example, the in-memory and file-backed devices), and the help text for the default device.
Example 2. Inspect a specific frame buffer before writing an image to it
fbhelp -F /tmp/output.pix
pix-fb -F /tmp/output.pix scene.pixQueries the file-backed (/tmp/output.pix) frame buffer to confirm it is available and learn its capabilities, then uses pix-fb(1) to display a pix(5) image on that same device.
SEE ALSO
brlcad(1), fb-pix(1), pix-fb(1), fbclear(1), libdm(3)
AUTHOR
BRL-CAD Team
COPYRIGHT
This software is Copyright (c) 1989-2026 by the United States Government as represented by U.S. Army Research Laboratory.
BUG REPORTS
Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org