Card reader question

[Petter Adsen]

On Sat, 18 Jul 2015 10:14:56 -0400
Robert Heller <heller at deepsoft.com> wrote:

> At Sat, 18 Jul 2015 14:45:03 +0100 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
> 
> > 
> > On 18 July 2015 at 01:02, Phil <phil_lor at bigpond.com> wrote:
> > > Thanks Colin. I've since realised that I can no longer make an image of the
> > > SD card read from the USB card reader. Backup yes but not an image.
> > 
> > Why not, I do exactly that with
> > sudo dd if=/dev/sdb of=$FILENAME bs=10M
> 
> I think the OP's problem is that this cannot be easily automated, since the if
> argument is not a constant value and there isn't a good way to compute the
> value. OTOH, doing a file oriented backup (ala mount+tar for example) *can* be
> automated, since it is possible to use either LABEL= or UUID= as the device
> argument to mount, which removes the need to know the exact device file
> (/dev/sd<mumble>, etc.) to use.

You could, for example, parse the output of 'blkid'.

'blkid -L FOO'

will give you the device node of the device with the LABEL FOO. Use
'-U' for UUID.

I would say that fairly easily lends itself to be automated.

Petter

-- 
"I'm ionized"
"Are you sure?"
"I'm positive."
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