Date: Mon, 24 Sep 2007 18:37:23 -0700 From: Gary Kline <kline@tao.thought.org> To: FreeBSD Mailing List <freebsd-questions@FreeBSD.ORG> Subject: sed question... Message-ID: <20070925013723.GA50027@thought.org>
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My earlier post about deleting the first N lines was answered by
this one-liner site {below}. I wasn't including any
redirection; doing so finally resolved the problem. Now I need
to delete every line from the 19th or so to the last line.
Question one, can anybody explain the following syntax? What do
"P", "D" "ba" represent, in other words?
# delete the last 10 lines of a file
sed -e :a -e '$d;N;2,10ba' -e 'P;D' # method 1
sed -n -e :a -e '1,10!{P;N;D;};N;ba' # method 2
Question two, can sed do its thing inline?
thanks in advance,
gary
--
Gary Kline kline@thought.org www.thought.org Public Service Unix
http://jottings.thought.org http://transfinite.thought.org
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