Add a newline only if it doesn't exist

Question

I want to add a newline at the end of a file only if it doesn\'t exists, this is to prevent multiple newlines at the end of the file.

I\'m hoping to use sed. Here\'s the

Answer 1

I solved this task by using dos2unix (or counterparts) with the --newline flag. The advantage is that these tools detect binary files on their own. I like the solution with tail -c1 but filtering binary files beforehand has been really slow for me.

dos2unix --newline my_file.txt

Eventually I wrote a script that searched my project directory, converted all files to LF (dos2unix) except *.cmd files (CRLF, unix2dos) and used the flag to get the newlines right with one call.