Every Termux session starts with a fresh shell and a set of named values it keeps for you. These questions cover reading those values, setting your own, and the one that decides which program runs when you type a name.
Each one is marked as you go, and the explanation arrives straight after, which is
the part worth reading.
4 questions, marked as you go.
Tasks
These need your own device. Run the command in Termux, then paste what it printed.
The marking looks at what the output means, so spacing, version numbers and
ordering do not matter. If you have not installed anything yet, the
lesson covers the setup.
Print the environment the shell gives you
This lists every environment variable in the current session, in alphabetical order. Read the names as well as the values.
Run this in Termux
On your own device. Nothing on this page executes it. The command runs in
your terminal, and this box only reads what you paste back.
printenv | sort
The list is long. Look for HOME, PATH, PREFIX and SHELL rather than reading every line.
the home directory variable is present
the command search path is present
the whole environment is printed, not a single value
the command actually ran
What a good answer looks like
A long list, one NAME=value pair per line, sorted so the names run from A to Z. The values differ from one phone to another, which is the point: your home directory, your search path and your locale are all personal to your device. Find HOME and PATH in the list and read them carefully, because those two decide where you land and which programs the shell can find by name.
Marking your own work
Both halves of this are checked in your browser, with no server involved, so nothing
stops you from pasting output you did not run. The tasks are written so that the
easiest way to pass one is to actually do it and read the result, which is the whole
intention.