NGINX rewrite script

Hi, Sometimes I’ve to add hundreds of redirects to my NGINX server block. Such a script could definitely make my work easier. I didn’t find ready-made solutions. I’m writing a script that gets addresses from a file and creates rewrite rules for NGINX based on it. The file just contains the old address and the new address separated by a space, for example:

old.html new.html
oldpage newpage
error.php 404

So I should get something like this:

rewrite ^/old.html$ https://domain.com/new.html permanent;
rewrite ^/oldpage$ https://domain.com/newpage permanent;
rewrite ^/error.php$ https://domain.com/404 permanent;

For now, my script looks like this:

if [ "$#" -eq 0 ]; then
    echo "Usage: ./rewrite.sh <domain> <file>"
    exit
else
    DOMAIN=${1}
    FILE=${2}
fi

sed -e 's/$/ permanent;/' -i $FILE #end of each line

It does nothing but add “permanent ;” to the end of each line. How do I add “rewrite ^/” to the beginning of each line? I tried this way, but it doesn’t work :

REW=“rewrite ^/” sed -i -e “s/^/‘${REW}’/” $FILE

I also have no idea how to add “$ https://domain.com/” in the beginning of the new address.