Despite having dabbled in *nix off and on for 35 years, it is only T that IL about cheat.
It's a wonderful wee command, which saves you from having to switch focus to a browser and rummage through Stack Exchange, by the simple expedient of giving you a few examples of a command you're about to use, thus obviating the need to hold vast amounts of syntax in your head.
An example:
$ cheat ls
# To display everything in <dir>, excluding hidden files:
ls <dir>
# To display everything in <dir>, including hidden files:
ls -a <dir>
# To display all files, along with the size (with unit suffixes) and timestamp
ls -lh <dir>
# To display files, sorted by size:
ls -S <dir>
# To display directories only:
ls -d */ <dir>
# To display directories only, include hidden:
ls -d .*/ */ <dir>To install this wonderful command, do this:
$ sudo snap install cheat
Of course, if you're not using snap, you'll first need to do this:
$ sudo apt update
$ sudo apt install snapd
I should say that I pinched these instructions from Snapcraft