shell替换某个目录下文件中的字符串

cd /home/work/dirname
find ./ -type f -name "*"  > filelist
while read myf
do
        sed "s#stringa#stringb#g" $myf > temp.txt
        sed "s#string1#string2#g" temp.txt > temp1.txt
        mv temp1.txt $myf
done < filelist
rm temp.txt