Termux.apk
Termux is an Android terminal emulator and Linux environment app.
Secure. Access remote servers using the ssh client from OpenSSH. Termux combines standard packages with accurate terminal emulation in a beautiful open source solution.
Feature packed. Take your pick between Bash, fish or Zsh and nano, Emacs or Vim. Grep through your SMS inbox. Access API endpoints with curl and use rsync to store backups of your contact list on a remote server.
Customizable. Install what you want through the APT package management system known from Debian and Ubuntu...