Add new line character at the end of file in bash

Question

How can I use bash command line to add new line character at the end of file named file.txt. I tried use echo but it's not right. Can you show me how can I do it?

Answer 1

echo "" >> file.txt

Adds a newline character at the end

Answer 2

This works on centos the empty string above didn't.

sed -i -e '$a\' file

Answer 3

GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin14)

echo \ >> file.txt

Answer 4

Use Vi which automatically creates EOL at EOF on file save.

For example:

vi -escwq foo.txt

or:

ex -scwq foo.txt

To correct multiple files, check: How to fix 'No newline at end of file' for lots of files? at SO

Answer 5

With sed:

sed -i '' -e '$a\' file.txt

with echo:

echo  >> file.txt