Have you ever wanted to run a Linux shell on your iOS device to transfer files, write shell scripts, or simply to use Vi to develop code or edit files?  Now you can, with a project called iSH that is currently available as a TestFlight beta for iOS devices. […]

from https://www.bleepingcomputer.com/news/linux/ish-an-ios-linux-shell-for-your-iphone-or-ipad/