SSHDroid is a server on the android device. On a Linux computers console, login is done with ssh -p 2222 root@192.168.1.35 and exit (maybe multiple exit commands are required) to log out.

It is also possible to login via a public key file that needs to be first transferred from the android device to the Linux computer. The manual says any user name will work, however it must be a user that exists on the android device (as system)

ConnectBot is a ssh client

Termux a terminal program where

pkg update && pkg upgrade Update packages

pkg install openssh gets ssh comand

pkg install inetutils gets ping, ifconfig, etc.