Add Add A Bunch Of CLI Utilities With corutils as a Mac TIL

mac/add-a-bunch-of-cli-utilities-with-coreutils.md

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+# Add A Bunch Of CLI Utilities With coreutils
+
+The [`coreutils`](https://www.gnu.org/software/coreutils/) project is a
+collection of useful utilities that every operating system ought to have.
+
+> The GNU Core Utilities are the basic file, shell and text manipulation
+> utilities of the GNU operating system. These are the core utilities which are
+> expected to exist on every operating system.
+
+While many of these utilities are redundant with BSD utilities that MacOS
+chooses to ship with, there are some differences in the overlapping ons and then
+many additions from `coreutils`.
+
+They can be installed with Homebrew:
+
+```bash
+$ brew install coreutils
+```
+
+And then you should have some new things available on your path. Take `shuf`, for
+instance. This utility can shuffle and select items from a file or incoming
+lines from another command. Here I use it to randomly grab a number between 1
+and 5 (with the help of `seq`):
+
+```bash
+❯ seq 1 5 | shuf -n 1
+3
+
+❯ seq 1 5 | shuf -n 1
+2
+
+❯ seq 1 5 | shuf -n 1
+5
+```
+
+Or how about some utilities for manipulating file names? Among others there is
+`realpath`, `basename`, and `dirname`.
+
+```bash
+❯ realpath README.md
+/Users/lastword/dev/jbranchaud/til/README.md
+
+❯ realpath README.md | xargs basename
+README.md
+
+❯ realpath README.md | xargs dirname
+/Users/lastword/dev/jbranchaud/til
+```
+
+See the [manual](https://www.gnu.org/software/coreutils/manual/coreutils.html)
+for many more details.