On Wed, 2 Nov 2011, Greg KH wrote: > On Wed, Nov 02, 2011 at 12:49:36PM -0700, Perry Wagle wrote: > > >From a script, I need to retrieve, if possible, the serial number of > > each disk-like device on my embedded system running linux 2.6.31 > > (yeah, I know, its not my choice). > > > > I find it in (say) /proc/scsi/usb-storage/3, where 3 is the scsi # it > > got this time. > > > > If I search on the web, they say its impossible to get the serial > > numbers of usb devices, but obviously, they are wrong. > > > > Is there a right way to retrieve the serial number of, say, /dev/sdb, > > from the maze of twisty symlinks in /sys and /proc? Or do I make one > > up and hope I thought of all the special cases? > > Do you want the serial number of the disk, or the serial number of the > USB device itself (note, they aren't the same.) The serial number displayed under /proc/scsi/usb-storage is the USB serial number. > For the disk serial number, I think you need to do a scsi command to the > device to get it. > > For a usb serial number, wind your way backwards from the > /sys/dev/block/ symlink to get to the USB device in charge of that > device to get the serial number. So for example, to get the serial number corresponding to /dev/sdb, you would read /sys/block/sdb/../../../../../../serial. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
