Termux

For Android users: you can have the power of the Linux command line in your phone.

Downlaod

https://f-droid.org/packages/com.termux/

What is it good for? See the examples.

Calendar

gcal

Python Calculator

python

Checking Weather

weather

Aliases

You can create shortcuts to these commands by modifying bash.bashrc

vi ../usr/etc/bash.bashrc

then after saving the modifications (esc then :x)

source ../usr/etc/bash.bashrc