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* Create `mkdir` copy with long options * Refresh mkdir command pages: - new example for setting permissions - better descriptions - better placeholders * Use imperative mood in titles * Don't use brace expansion * Apply suggestions from code review Co-authored-by: Axel Navarro <navarroaxel@gmail.com> * Better describe -p flag * Remove linux/mkdir because: - mkdir is available on several platforms Co-authored-by: Axel Navarro <navarroaxel@gmail.com>