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From: Rob Pike <robpike@gmail.com>
Date: Sun,  5 Aug 2012 17:52:48 -0700
Message-ID: <CAKzdPgyk1TDp+zKxRVURKeg-Z30wWQ_g6OXgGoYBPz9R9rXzRg@mail.gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Content-Type: text/plain; charset=UTF-8
Subject: Re: [9fans] sam, shorten dot by 1 line
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.+0 goes from the end of the current value of dot to the end of the
line containing dot.
.-0 goes from the beginning of the line containing dot to the
beginning of the current value of dot.

I don't understand your second question.

-rob