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nano - text editor
not sure if yellow dog has nano but that's relatively easy to use
also about the runlevel biz
1 = single user mode (e.g for administrive maintainance and stuff)
2 = ?
3 = multiuser text only mode
4 = ?
5 = GUI mode (multiuser)
each mode can be jumped to by typing init x (x = runlevel number)
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