1A - Termux for Android

Termux is a free and open source terminal emulator for Android which allows for running a Linux environment on an Android device. In addition, various software can be installed through the application's package manager. Termux is the first Android terminal application to include a variety of software, unlike other terminal emulators, in which only small or limited utilities provided by Android are available. Termux installs a minimal base system automatically, and additional packages are available using a package manager. Most commands available in Linux are accessible as well as built-in Bash commands. There are also several other shells available, such as Zsh and tcsh.