A script to find differences in PCI configuration space on Linux

diff-pci-configs.sh

#!/bin/bash

set +e

if ! [ "`id -u`" == '0' ]; then
	echo 'This script must be run as root'
	exit
fi

mkdir -p diff-pci-configs-data
cd diff-pci-configs-data

for i in /sys/bus/pci/devices/*; do
	hd $i/config >`basename $i`-before
done

echo "Do what you want, and press Enter."
read

for i in /sys/bus/pci/devices/*; do
	hd $i/config >`basename $i`-after

	echo ">>> `lspci -s $(basename $i)`"
	diff -U0 `basename $i`-before `basename $i`-after
done