Re: [lopsa-discuss] Stupid sed question, or, Is sed even the smartest way to do this?

[Brandon S. Allbery KF8NH]

On Jun 16, 2010, at 05:37 , Trey Darley wrote:

Say you've got a simple ascii text file, say, 250,000 lines long. Let's say it's a logfile. Suppose that you wanted to access an arbitrary range

of lines, say, lines 10,000 - 13,000. One way of doing this is:

<snip>
sed -n 10000,13000p foobar.txt
</snip>

Trouble is, the target systems I need to exec this on are ancient and

a better way of achieving this?

don't take very kindly to the io hammering this delivers. Can you suggest

tail +10000 foobar.txt | sed 3000q   # salt head/tail with -n as posixly
tail +10000 foobar.txt | head -3000  # appropriate

Many commercial u*ixen have "bfs" which is optimized for large files.

echo 10000,13000p | bfs - foobar.txt

--
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com
system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH

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