[kwlug-disc] Parsing Devices Names

[William Park]

On Sat, Dec 03, 2016 at 09:32:05AM -0500, John Driezen wrote:
> I am doing some modifications to the scripts supplied with vortexbox 2.4.  I
> am trying to parse the output of wodim --devices to extract the device
> names.
> 
> wodim: Overview of accessible drives (4 found) :
> -------------------------------------------------------------------------
>  0  dev='/dev/sr0'    rwrw-- : 'HL-DT-ST' 'DVD-RAM GH22NS30'
>  1  dev='/dev/sr1'    rwrw-- : 'HL-DT-ST' 'DVDRAM GH22NS50'
>  2  dev='/dev/sr2'    rwrw-- : 'HL-DT-ST' 'DVDRAM GH22NS50'
>  3  dev='/dev/sr3'    rwrw-- : 'ATAPI' 'DVD A  DH16A6L'
> -------------------------------------------------------------------------
> 
> The following command
> 
> wodim --devices | awk '/dev=/ { print substr($2,index($2,"/"),8) }'

If it is always 
    dev='...'
then
    wodim --devices | awk -F \' '/dev=/ {print $2}'


> 
> produces the following desired output:
> 
> /dev/sr0
> /dev/sr1
> /dev/sr2
> /dev/sr3
> 
> except that I don't want to assume that the length of the device name is
> only 8 characters long.  Suggestions anyone?  A sed script would be
> acceptable as well, but I don't know sed.
> 
> John Driezen
> jdriezen at sympatico.ca