Pretty filenames

Pretty filenames contain no characters other than 0–9, A–Z, a–z, - (dash), . (dot), and _ (underscore).

They are separated by / (slash) in paths.

The prettiest filenames replace A–Z with a–z, and _ (underscore) with - (dash).

You can find files and directories with ugly filenames like so:

find -regex '.*[^a-z0-9A-Z/._-].*' -prune

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