Doesn’t happen often but every now and then I’m confronted with a bunch
of files that should have a newline as the last char of the file, but
some or all of them don’t. A few months back it was postfix config files
(postconf assumes there’s a newline at the end when adding a new config
option), and today it was the source files for this blog. In the latter
case not exactly required, but “nice to have.”
The solution, surprisingly, is ed. It will always append a newline to a file if it’s missing.
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That does have some zsh-isms in it, so you can also do this on more limited shells:
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The downside is that this will update the timestamps on every file. I’ve never
had a situation where I cared, but some touch magic would probably fix it.