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Thank y all for y support.
There is another solution but only with sed:
ghoto2 --get-config /main/imgsettings/iso | sed -n "/Current: /h;G;s/Choice: \([0-9]\+\) \(.*\)\nCurrent: \2/\1/p"

No user interaction. The gphoto cmd to return iso is calling by node.js for automatic scripting. The filtered result by a nested sed or greb command should return always the integer of the current...

No index 3 is what i have to found and this value can change next time if i call this statement again. gphoto returns the current setting of the ISO on the digital camera and this can changing. So...

I am confused, how does your code filter by "200" on "Choice x: xyz...." ?

Hi,
I get the following response by gphoto2 and I would like to substract the index number of the current item. In this case 3.
gphoto2 --get-config /main/imgsettings/iso
Label: ISO Speed...