问如何将字符串添加到bash文件夹中每个文件的开头？

EN

for f in *; do 
  echo "whatever" > tmpfile
  cat $f >> tmpfile
  mv tmpfile $f
done

sed -i '1i whatever' *

awk 'FNR==1{$0="whatever\n"$0;}{print $0>FILENAME}' *

FOLDER='path/to/your/folder'
TEXT='Text to prepend'
cd $FOLDER
for i in `ls -1 $FOLDER`; do
     CONTENTS=`cat $i`
     echo $TEXT > $i  # use echo -n if you want the append to be on the same line
     echo $CONTENTS >> $i
done