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TIL that `head -5` is equivalent to `head -n 5`, and that's not in the manual

It’s called out as obsolete in the coreutils documentation, https://www.gnu.org/software/coreutils/manual/html_node/head..., which probably explains the lack of references in the manual

Depends on which manual you read; e.g., it's documented in https://illumos.org/man/1/head