Re: [gentoo-user] serial in /sys

[Jorge Almeida <jjalmeida@gmail.com>]

On Thu, Nov 29, 2012 at 6:35 PM, Marco Bonfiglio
<marco.bonfiglio@gmail.com> wrote:
>
>
> 2012/11/29 Jorge Almeida <jjalmeida@gmail.com>
>>
>> Anyone knows how to dig into /sys to find the serial number of a device
>> (say,
>> a USB pen)? I few days ago I found by trial and error something like
>> $ cat
>> /sys/devices/pci0000:00/0000:00:06.1/usb2/2-4/2-4:1.0/host13/target13:0:0/13:0:0:0/block/sdc/../../../../../serial
>> which gave me E68911000519
>> Now I can't find nothing of the sort. (Yes, I know the path changes
>> each time the
>> device is plugged in, but even so)
>> Any information that would put some order into this mess would be great.
>>
>> TIA
>>
>> Joreg Almeida
>>
>
> If by "serial" you mean UUID I personally use "ls -l /dev/disk/by-uuid/"
>
It is not the same thing, but anyway I have in /dev/disk/by-id/ a symlink
 usb-silicon_-power_E68911000519-0:0 -> ../../sdd

This is indeed the device I meant, and the serial number is the "E68911000519"
substring. But this symlink exists because udev created it. I need to somehow
dig it out of /sys, not out of /dev. IOW, how did udev retrieved the
information to create the symlink? The values of ../by-uuid/ would probably be
equally good, but I don't know how to find them any more than I know how to
find the serials...

Thanks

J.A.