From: Rob Pike <robpike@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] sam, shorten dot by 1 line
Date: Wed, 1 Aug 2012 15:21:11 -0700 [thread overview]
Message-ID: <CAKzdPgyCVKw-FBJr9FbOO5bRXTcMrmeiJLa3TBuLnYyFCxXMcw@mail.gmail.com> (raw)
In-Reply-To: <CAOEdRO2JjuFyQnejo0rpppZ0pJt9az_2RDjoHgcb7vvg6e-+aA@mail.gmail.com>
Break it down:
a,b means: from the beginning of a to the end of b
.,. means: from the beginning of . to the end of .
1 means: from the beginning of line 1 to the end of line 1.
.,.+0 means: from the beginning of . to the end of .+0, and .+0 is the
null string at the end of .
Now the step:
.,.+0-1 means: from the beginning of . to the end of .+0-1, which
means the end of the line preceding the null string at the end of .,
which ends right back at .+0, so it means the last line of ., so this
doesn't work.
.,.+0-2 means: from the beginning of . to the end of .+0-2, which
means the end of the second line preceding .+0, which is one line back
from the end.
QED.
The key observation is that on the right of the comma you're talking
about where the address *ends*.
-rob
next prev parent reply other threads:[~2012-08-01 22:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-01 16:37 Rudolf Sykora
2012-08-01 19:09 ` Rob Pike
2012-08-01 20:21 ` Rudolf Sykora
2012-08-01 20:51 ` Rudolf Sykora
2012-08-01 22:21 ` Rob Pike [this message]
2012-08-02 8:45 ` Rudolf Sykora
2012-08-05 8:19 ` Rudolf Sykora
2012-08-06 0:52 ` Rob Pike
2012-08-06 7:04 ` Rudolf Sykora
2012-08-06 10:53 ` tlaronde
2012-08-06 15:05 ` Rob Pike
2012-08-10 9:32 ` Rudolf Sykora
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