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#!/bin/bash
#
# usage: sudo who.sh
#
# Requires root permissions to both query who has the device open,
# and to read the mappings of likely root-owned processes
#
for i in `lsof -t /dev/dri/card0`; do
who=`readlink /proc/$i/exe`
count=`grep /dev/dri/card0 /proc/$i/maps | wc -l | cut -f1 -d\ `
echo "$who [$i]: $count"
done