How can I decide what /dev/input/eventX file to read for special usb device?

I have usb keyboard and i need to read events from it with shell script (evdev module 
gives /dev/input/event[0|1] file, from which I read with hexdump). While testing, I 
found that for the same keyboard the event file is different on different systems 
(event1 at my home, event0 at work). How could I (and my script) determine exactly 
from 
where to read for this keyboard events?

Probably I must get dmesg, found last line and get event file number? Or get it 
from /proc/bus/usb/devices?

--
Best regards, your Anton


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