Omg, there’s a terminal emulator for iOS. I’m surfing the filesystem from a command line and editing code in vi — on my iPad! And it lets you open multiple windows (so you can edit multiple files at the same time) and since you have access to the file system you don’t have to share sheet all over the place to get those files open in the app. Here’s the github page, but you can also find it in the app store. https://github.com/holzschu/a-shell