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while read words.dat
do
find . -type f | xargs grep -i "${words.dat}=" 2>/dev/null >> out.log
done < words.dat

@find = `find . -type f | xargs grep -i  sales= 2>/dev/null`;
@find = `find . -type f | xargs grep -i  price= 2>/dev/null`;
@find = `find . -type f | xargs grep -i  invoice= 2>/dev/null`;