How to make cat start a new line

Question

I have four files:

one_file.txt

abc | def

two_file.txt

ghi | jkl

three_file.txt

m         


        

Answer 1

You can loop over each file and do a check to see if the last line ends in a new line, outputting one if it doesn't.

for file in *file.txt; do
    cat "$file"
    [[ $(tail -c 1 "$file") == "" ]] || echo
done > full_set.txt