Find and replace in file and overwrite file doesn't work, it empties the file

Question

I would like to run a find and replace on an HTML file through the command line.

My command looks something like this:

sed -e s/STRING_TO_REPLACE/STR         


        

Answer 1

use sed's -i option, e.g.

sed -i bak -e s/STRING_TO_REPLACE/REPLACE_WITH/g index.html