Shell SSH is a focused SSH client for iPhone and iPad. It opens a real interactive terminal to the servers you administer — not a box that runs one command at a time.
CONNECT
• Save hosts with a name, address, port, username and notes
• Authenticate with an SSH key or a password
• Servers that only offer keyboard-interactive login, as some two-factor setups do, aren't supported yet
• Search across names, addresses, usernames and notes
• Open several sessions at once as tabs, and switch without disconnecting
• On iPad, run two terminals side by side and drag the divider where you want it
• Your tabs and your split come back the way you left them when you reopen the app…
From the developer’s store description.