BTW, before you go installing Termux from the play store, you should know that they no longer have the latest version there. Its recommended that you get it through the open source F-droid app store.
I guess I should have made it more clear, the guy in the picture is not the Michael Sweet who developed CUPS, it's Michael Sweet, the Chirstian Metal singer/guitarist. I mean maybe he used Unix, but given the demons, probably not.
Over the years I've learned a lot about security of the command line itself. One way I'll be resharing my knowledge with those in Higher Ed InfoSec is by giving a 3 hour workshop dedicated to the topic on May 3rd at the Educause C&PPC conference. Details: https://bit.ly/3KEpjSO
From @b0rk on the birdsite, a collection of newish command line tools. https://jvns.ca/blog/2022/04/12/a-list-of-new-ish--command-line-tools/