Shell append string to file empty line problem

Question

I am using this shell script to append text in a new line at the end of file, but it automatically adds a blank line at the end of the file. How to get rid of it?

echo -e "\n$STRING" >> "filename.txt"

Thanks

Answer 1

echo -ne "\n$STRING" >> "filename.txt"

The -n means "don't add a newline".