POSIX

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cp's -r vs -R flag debate resurfaces●cp: -r or -R?Yhn9714 min ago
A blog post by developer movq examines a long-standing quirk of the Unix cp command: whether the recursive copy option should be written as lowercase -r or uppercase -R. The two flags have subtly different histories across BSD, GNU and POSIX systems, and the piece walks through what each specification actually guarantees, reigniting a familiar argument among command-line users.

cs341-illinois/coursebook Open Source Introductory Systems Programming Textbook for the University of Illinois
rcalixte/ncdu NCurses Disk Usage (an updated fork)