Coreutils
You have already learned about some of the contents of a package of useful command-line tools called GNU Coreutils. It includes some of the most used commands like ls, mv, cp, rm, and cat. It also contains a ton of lesser known, but incredibly useful tools. This package is installed by default. Few people ever make use of its richness. You will want to explore it more deeply. Coreutils contains so much, it is worthy of a chapter and maybe a book of its own. What we can do here is point you to the GNU website entry for Coreutils as https://www.gnu.org/software/coreutils/ and also the info page at info coreutils (there is no man page for Coreutils).
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