My question will depict that I can't figure the real distance between an Android operating system and a Linux distro.
When I try most distros that have an UI, from the earliest to the most recent one, the simplest to the one for experts, all are offering a shell. sh, bash, etc. If I try one on distrosea or another web site of that kind, I'm sure to have at least this feature, to try my ls or pwd command...
But there's nothing like that on my Android phone.
It's not the purpose of a smartphone to offer a terminal opening on a shell prompt, that's true. But for years that they exist, I guess some users would have thought about it.
But I never seen a terminal on a smartphone... If no place nowhere offers me to install one, it's surely that it's impossible.
And I'm asking myself: if for thousands of distros having an UI a terminal application opening to a shell is available, why can such terminal absolutely not exist in an Android Operating System, if is it of Linux kind? What is preventing it?
Epilog: I've lost reputation points but I've gained an useful knowledge. I was sure, not having searched efficiently, that they were no way to access to a shell on an Android phone.
And I've learned the contrary. I'm happy. Thanks!

termuxworks really well