use screen for multiple "terminals"
use midnight-commander for your file manager
for an editor, I would have recommened vi. It has a steep learning curve but once you get the hang of it...well I find myself pasting from notepad to vi just so I can get stuff done faster. Otherwise you can use emacs, nano, pico, this list goes on.
Screen takes a bit to get used to, just remember C-a, C-?
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