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From: gbuchanan@on.sympatico.ca (Gardner Buchanan)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: how to cut a piece of file?
Date: 17 Jul 1997 00:49:06 GMT
Organization: Sympatico
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In article <33CCD3A6.CADC65F7@mcnet.ch>,
Michel Rueger <Michel.Rueger@mcnet.ch> writes:
> I'm working on Free BSD 2.2.1 and I have to make a new file with the
> last 10Mb of a 200Mb log file. How can I do that (without editing the
> file...! :))
Look at tail(1):
TAIL(1) FreeBSD General Commands Manual TAIL(1)
NAME
tail - display the last part of a file
SYNOPSIS
tail [-f | -r] [-b number | -c number | -n number] [file ...]
DESCRIPTION
The tail utility displays the contents of file or, by default, its stan-
dard input, to the standard output.
:
:
Something like:
tail -b 20480 200Mb-file > 10Mb-file
should do the trick.
Alternatively you could write a simple program based around read(2),
write(2) and lseek(2).
============================================
Gardner Buchanan <gbuchanan@sympatico.ca>
Ottawa, ON