Back in 2008 and 2009, I've already introduced (see THIS and THIS) MobileTerminal (by Allen Porter), a local, Cydia-based (sorry, jailbreak is required!) terminal emulator you can use for a lot of things; among other things, changing the root password from the default „alpine” to something (if you do install OpenSSH) less dangerous.
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A quick tip: terminal emulators and programmatic password changing for iOS
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