Since there isn’t anything quite like Termux for iOS (please correct me if you find something), I would recommend simply using the iPad to connect to a remote m

Since there isn’t anything quite like Termux for iOS (please correct me if you find something), I would recommend simply using the iPad to connect to a remote machine, through SSH or otherwise. That way you get the full power of the Unix shell alongside the convenience of iOS apps. You could even configure your remote machine so that files you edited with SSH were also available over WebDAV or (secure)FTP, since many apps support read/write from those servers. I’m not sure you’re going to get the experience of Visual Studio Code from the command line, but if you’re really hooked on it as an editor you could use VNC and take the speed/responsiveness penalty.