I’m addition to tldr which someone else suggested, there’s also the cheat command. It’s pretty easy to add to it’s cheat sheets, if you have custom commands, or want to keep a specific example. I’ve never kept a physical cheat sheet… They’re just too inconvenient and my fingers are probably already at the keyboard.

As others have said, RHEL is not going closed source. They are not violating the letter of the GPL (though IMO, certainly the spirit of it).

I think this is a crappy move by RedHat/IBM and I won’t excuse it, but I will say in their defense they are one of the largest contributors to open source. Everything from the kernel to Gnome and in between. It’s a massive step back from the company they were 5 years ago, though.

You may want to research this some more. Spinning the drive up and down adds wear on the mechanical parts, and will lead to the drive failing a lot sooner.

Maybe you’re okay with that tradeoff, just thought you should at least be aware of it.