10-26-2001
>/dev/null
Maybe it's an stupid question but remeber... I'm Junior..
I use command line to run programs, and some of them gives a lot of information when, for example, you open a window or other actions. That's really bad because my terminal gets full of unwanted messages, so I use "bin file & >/dev/null" to avoid the problem.
It work's fine for almost any program but it doesn't work for others ( mozilla ). I know that maybe is because the file that I execute calls other files and are the others that send those messages to my screen.
So here is my question: How can I force a file and childs to use /dev/null as info/error output.
Thanx and sorry for my poor english. It's not my natural language..
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LEARN ABOUT DEBIAN
dv4lstart
DV4LSTART(1) General Commands Manual DV4LSTART(1)
NAME
dv4lstart - redirect V4L API to access a camcorder from a V4L program
SYNOPSIS
dvlstart [options] command [argument ...]
DESCRIPTION
dv4lstart enables command to access a dv1394 (Firewire) camcorder by using the video4linux (V4L) API. dv4lstart uses the LD_PRELOAD facil-
ity to intercept calls to the V4L API and make the camcorder's videostream available.
Check that LD_PRELOAD works in your environment by starting
$ dv4lstart ls -l /dev/video0
The resulting output should look like
crw-rw---- 0 root video 81, 0 Jan 1 1970 /dev/video0
Check your 1394 driver config by starting
$ gst-launch-0.10 dv1394src ! dvdemux ! dvdec ! xvimagesink
from your shell. After turning on your camera, a video window should appear. If this works, dv4lstart should work as well.
Inside command, use /dev/video0. Any existing, real V4L device named /dev/video0 can not be accessed from an application started with
dv4lstart (applications started normally can access the real /dev/video0)
OPTIONS
-c, --color-correction
Set this option if red objects look blue.
-n, --new-dev
Tell dv4lstart to simulate a new video device rather than overriding /dev/video0. Set this option if your application needs to
access other video devices.
-r, --rgb-only
Set this option to prevent V4L applications from choosing YUV palettes. Try this option if you get low frame rates.
-v, --verbose level
Set the amount of debugging messages. A level of 0 means no output at all, 1 is the default, 3 enables all messages.
-h, --help
displays a help message
EXAMPLES
The command
$ dv4lstart v4l-info
outputs some information about the simulated V4L device.
$ dv4lstart -c gqcam -v /dev/video0
starts the gqcam webcam viewer, swapping red and blue colors.
LIMITATIONS
Programs using exotic ways to access the V4L API will not work.
Some environments don't allow the use of LD_PRELOAD for security reasons. dv4lstart will not work there.
If dv4lstart does not work, try dv4l instead.
SEE ALSO
dv4l(1)
DV4LSTART(1)