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Sending key events to background script

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Old 02-20-2011
Sending key events to background script
Hi,

short summary:
I need to send keystrokes from USB keyboard to background (bash-)script. I guess I have to use read on the right devive board but how and which?

My details:

I got a small home server with some VMs using KVM/Qemu, all are suse 11.3. But in general I work on a client using a keyboard switch. Additionally, I have a scanner (HP Officejet 6500).

Now I want to send scans into a VM. I did not get the scan button to work but I want to achieve a similar solution. I bought a numerical keyboard with USB connector, connected it to the server and fowarded the port into the target VM.
Next there should be a background process listening to that kayboard and running a variety of scanimage scripts when the numbers are pressed.

I found the keyboard device under /dev/input/by-id/... and probably also under /dev/bus/usb/001/00[1-4]. Unfortunately, the output looks very "raw". I guess there must be an other device to connect to?

Thank you for your help,
Snowman
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LEARN ABOUT CENTOS

usb-devices

usb-devices(1)							Linux USB Utilities						    usb-devices(1)

NAME

       usb-devices - print USB device details

SYNOPSIS

       usb-devices

DESCRIPTION

       usb-devices is a (bash) shell script that can be used to display details of USB buses in the system and the devices connected to them.

       The  output  of	the  script  is similar to the usb/devices file available either under /proc/bus (if usbfs is mounted), or under /sys/ker-
       nel/debug (if debugfs is mounted there). The script is primarily intended to be used if the file is not available.

       In contrast to the usb/devices file, this script only lists active interfaces (those marked with a "*" in the usb/devices file)	and  their
       endpoints.

       Be advised that there can be differences in the way information is sorted, as well as in the format of the output.

RETURN VALUE

       If sysfs is not mounted, a non-zero exit code is returned.

FILES

       /sys/bus/usb/devices/usb*
	      The part of the sysfs tree the script walks through to assemble the printed information.

       /proc/bus/usb/devices
	      Location where the usb/devices file can normally be found for Linux kernels before 2.6.31, if usbfs is mounted.

       /sys/kernel/debug/usb/devices
	      Location where the usb/devices file can normally be found for Linux kernel 2.6.31 and later, if debugfs is mounted.

SEE ALSO

       lsusb(8), usbview(8).

AUTHORS

       Greg Kroah-Hartman <greg@kroah.com>

       Randy Dunlap <rdunlap@xenotime.net>

       Frans Pop <elendil@planet.nl>

usbutils-007							   23 June 2009 						    usb-devices(1)