How can I replace all sequences of a dot followed by a space with a dot followed by a new line?
On a unix box, with POSIX tools.

I thought `sed` or `tr` might be up for the job. But I can not figure it out.
I tried things like

```sh
sed 's/. /.\n/g' file

```

Reading
[How can I replace a newline (\n) using sed?](https://stackoverflow.com/questions/1251999/how-can-i-replace-a-newline-n-using-sed) did not make it happen for me.

EDIT: I was lost between the different escapes and forgot that I should escape the dot. so `sed 's/\. /\.\n/g' file` works for me.