On this fan request roulette, we take a look at GNU coreutils, a collection of essential utilities for any GNU Useful links: - Site: https://www.gnu.org/software/coreutils/ - Code (Official): https://git.savannah.gnu.org/cgit/coreutils.git - Code (Mirror): https://github.com/coreutils/coreutils - How is GNU `yes` so fast?: https://www.reddit.com/r/unix/comments/6gxduc/how_is_gnu_yes_so_fast/ (and the HN discussion: https://news.ycombinator.com/item?id=14542938) Related videos: - Bash: https://www.youtube.com/watch?v=8Q3a5Ru8rqo - Sed: https://www.youtube.com/watch?v=Zxe7WaAkvIg