使用sed，awk将love转换成LOVE，将CHINA转换成china

                    将love转换成LOVE，将CHINA转换成china                       

echo "love CHINA" | sed -e 's/love/LOVE/' -e 's/CHINA/china/'
echo "love CHINA" | sed -e 's/love/LOVE/' | sed -e  's/CHINA/china/'


echo "love CHINA" | awk '{gsub(/love|CHINA/,"LOVE,china");{print $1}}'