How can I prepend a string to the beginning of each line in a file?

Question

I have the following bash code which loops through a text file, line by line .. im trying to prefix the work \'prefix\' to each line but instead am getting this error:

Answer 1

Use sed. Just change the word prefix.

sed -e 's/^/prefix/' file.ext

If you want to save the output in another file

sed -e 's/^/prefix/' file.ext > file_new.ext