It's strange that if I instead with "grep -v "$line" file2" it will go endless loop，I want to show the file2'line that not contains file1

Thanks
Lei

---------- Post updated at 02:50 AM ---------- Previous update was at 02:44 AM ----------

sorry,it's not a endless loop, I make a mistake, actually want to show the file2 which not contains file1's line, how could I do that

---------- Post updated at 02:52 AM ---------- Previous update was at 02:50 AM ----------

and with below cmd

Code:

while read line
do
    sed -i '/${line}/d' ./file2 #to delete the line which contains in file1
done < ./file1

it will casue error, I don't know why