[c-nsp] display last lines of logging

[Robert Blayzor]

Rodney Dunn wrote:
> Good suggestion. Let me see if I can convince development to code it.


Well there already begin, inc, exc, etc...

It would be nice to add "last" and "top", etc:

sh log | top     (shows top 10 lines)
sh log | last    (shows last 10 lines)
sh log | last 20 (shows last 20 lines)
sh log | top 5   (shows top 5 lines)


top and last could easily be replaced with "head" and "tail", but that's
 just the unix geek coming out! :-)

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