Write a shell script to add the statement #include at the beginning of every C source file in current directory containing printf and fprintf

clear
grep -lw -e "printf" -w -e "fprintf" *.c > $$
for filename in `cat $$`
do
 sed '1i\
 #include\
 #include
 ' $filename > $$$
 `cat $$$>$filename`
 rm $$$
done
echo "File corrected successfully"
rm $$

Output: 

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