Hi Rob Taking the simple method, this works for me: udevadm info -a -p $(udevadm info -q path -n /dev/tty3) | grep -e KERNEL -e SUBSYSTEM
Signed, Captain Obvious! <g> -- Rob Echlin, B. Eng. 613-266-8311 - Ottawa, ON http://talksoftware.wordpress.com - http://picasaweb.google.com/coderoller >________________________________ > From: Robert P. J. Day <[email protected]> >To: Ottawa Linux Users Group <[email protected]> >Sent: Saturday, March 16, 2013 1:41:17 PM >Subject: [OCLUG-Tech] how to use udevadm to print *just* KERNEL and SUBSYSTEM? > > > currently writing a tutorial on udev and i'm drawing a blank on >something that should be simple -- what variation of udevadm can i use >to print just the KERNEL and SUBSYSTEM values corresponding to a >device? > > here's the tutorial: > >http://www.crashcourse.ca/wiki/index.php/Udev > >it's still *very* incomplete but, partway down, you can see how to do >an attribute walk on (in my case, using the example of a usb-serial >cable) /dev/ttyUSB0: > >$ udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB0) > >that command generates a pile of output, and what i care about is at >the very beginning: > > looking at device >'/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/ttyUSB0/tty/ttyUSB0': > KERNEL=="ttyUSB0" > SUBSYSTEM=="tty" > DRIVER=="" > >all i want are the values of KERNEL and SUBSYSTEM since it's those >values that are used by the rules file that's eventually consulted. so >for the sake of brevity, i want to figure out what command and options >will print just that, and i just can't find it. > > am i missing something obvious? > >rday > >-- > >======================================================================== >Robert P. J. Day Ottawa, Ontario, CANADA > http://crashcourse.ca > >Twitter: http://twitter.com/rpjday >LinkedIn: http://ca.linkedin.com/in/rpjday >======================================================================== >_______________________________________________ >Linux mailing list >[email protected] >http://oclug.on.ca/mailman/listinfo/linux > > > _______________________________________________ Linux mailing list [email protected] http://oclug.on.ca/mailman/listinfo/linux
