What is termux-api?

Termux:API is an Android app that lets you control phone features, like the camera, GPS, battery, clipboard, and notifications, from typed commands instead of tapping buttons on the screen. If you've ever wanted to write a short script that takes a photo, reads your current location, or checks battery level and saves the result to a file, this is the tool that makes that possible. It works as a companion to Termux, which is a terminal app for Android. When you type a command in the terminal, a helper program passes that request to the Termux:API app, which then talks to the phone's hardware and sends the result back to your screen. Under the hood, it uses a pair of communication channels to pipe input and output between your command line and the API app, but you don't need to worry about that detail, just type a command and get a result. The people who get the most out of this are tinkerers, power users, and anyone automating tasks on an Android device. For example, you could write a script that logs your GPS coordinates every ten minutes, or one that sends a text message when a file finishes downloading. It turns your phone into a programmable device where hardware features are just commands you can call from any script. One technical caveat: the app needs to share a security key with the main Termux app, so you can't just install it standalone and expect it to work, both apps need to trust each other. It's also open source under the GPLv3 license, so you can read and modify the code if you want to see exactly how it talks to Android's internals.