People are always more willing to trust a machine over their brain. I went into a national sandwich chain (some years ago). Ordered my usual sandwich, and the amount rung up wasn't the usual amount. Looked up at the board, it didn't indicate a price change. Pointed out to the counter person that the machine was overcharging me.

"oh yea, there was a price increase" - I pointed at the price board (unchanged). "But thats not the price". I reminded them that they have to honor the posted price, unless they wanted to be charged with fraud.

What made it particularly amusing: The manager didn't have an override so he could charge me the correct amount. (apparently they couldn't just say "misc taxable $4.73", they could only push the specific item buttons). He had a bit of a clue, and gave me the thing free.

I am sure lots of people didn't notice, and overpaid. The only reason I noticed, was that it took the total from under $5 to over $5. I happened to hand over a $5, and thus expected a few cents change, not a request for another quarter. (had they updated the sign, and not just the computer, I would have handed over the extra without comment)

My approach: start from Emacs unless it's impossible.

• It's necessary to go up to the system level to relocate some keys, namely the modifiers (Shift, Ctrl, Alt, Super) and Caps Lock.
• It's necessary to go up to the system level when you're making a seamless blend between Emacs and a window manager.

I expect the future's hacker will never need to learn the following mainstays of Unix, if they start from childhood on a workflow centred on Emacs' Dired and Eshell.

Some "deprecated" commands:

• cd
• ls
• tee
• echo
• sort
• cut
• ln
• uniq
• pwd
• tr
• awk / sed
• cp / mv
• rm / unlink
• less / more
• cat / tac
• visudo / sudoedit
• sudo / doas
• head / tail
• touch
• time
• chmod (though we're missing -R equivalent in dired)
• chown (though we're missing -R equivalent in dired)

The deprecated categories seem to have to do with:

• text munging
• filesystem navigation
• filesystem editing (i.e. renaming, moving, making directories, changing permissions…)
• (re-)directing inputs and outputs
• ?

Examples of commands we wouldn't deprecate (although you'll note many are amenable to a transient.el frontend which improves on them… in fact, it seems to me like you could partly automate the production of such frontends! And with that, I really question the immortality of shells.)

• rsync
• find / locate (though we'd use affe, helm and such frontends)
• grep / ripgrep (though we'd use affe, helm and such frontends)
• docker
• guix
• ip
• nft
• sysctl