grep "xengine" * -R | awk -F: '{print $1}' | sort | uniq | xargs sed -i 's/xengine/xengine/g'
grep "xengine" * -R | awk -F: '{print $1}' | sort | uniq | xargs sed -i 's/xengine/xengine/g'
grep "xengine" * -R | awk -F: '{print $1}' | sort | uniq | xargs sed -i 's/xengine/xengine/g'
grep "XENGINE" * -R | awk -F: '{print $1}' | sort | uniq | xargs sed -i 's/XENGINE/XENGINE/g'