An app that allows iOS users to run a Unix shell on their iDevice was under threat of removal from the App Store. However, Apple apparently reversed its decision, allowing the app to stay up. This could open the door for more scripting and shell apps to hit the App Store in the future.
https://www.notebookcheck.net/Unix-shell-app-for-iOS-threatened-with-removal-but-Apple-backtracks-on-decision.503414.0.html