I am using cat *.txt to merge multiple txt files into one, but I need each file to be on a separate line.
What is the best way to merge files with each
You can iterate through each file with a for loop:
for filename in *.txt; do
# each time through the loop, ${filename} will hold the name
# of the next *.txt file. You can then arbitrarily process
# each file
cat "${filename}"
echo
# You can add redirection after the done (which ends the
# for loop). Any output within the for loop will be sent to
# the redirection specified here
done > output_file