Attempt #3, adding a new command 'sfilter'

[Doug Barton]

Garance A Drosehn wrote:

> For those wondering what other esoteric option I would add, it's
> a pretty simple addition.  An option to prefix the lines with a
> relative timestamp (#seconds since the first line),

Add "#seconds since the last line" and you've got a real winner there. :)

Doug


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