How to fix “No newline at end of file” warning for lots of files?

Question

I have a huge number of source files that are all lacking a newline at the end.

How do I automatically add a newline to the end of each of them?

Some may alr

Answer 1

OK, after complaining in the comments, there is my better solution. First, you want to know, which files are missing newlines:

find -type f -exec sh -c "tail -1 {} | xxd -p | tail -1 | grep -v 0a$" ';' -print

Not super fast (calling a couple of processes for each file), but it's OK for practical use.

Now, when you have it, you may as well add the newline, with another -exec:

find -type f -exec sh -c "tail -1 {} | xxd -p | tail -1 | grep -v 0a$" ';' -exec sh -c "echo >> {}" ';'

Possible gotchas:

• if filenames are bad, e.g. they have spaces, you may need tail -1 \"{}\". Or does find do it right?

• you may want to add more filtering to find, like -name \*py, or the like.

• think about possible DOS/Unix newlines mess before use (fix that first).

EDIT:

If you don't like the output from these commands (echoing some hex), add -q to grep:

find -type f -exec sh -c "tail -1 {} | xxd -p | tail -1 | grep -q -v 0a$" ';' -print
find -type f -exec sh -c "tail -1 {} | xxd -p | tail -1 | grep -q -v 0a$" ';' -exec sh -c "echo >> {}" ';'