02-21-2006
Grep
When searching for "text" in a file,
I would like to see the line containing "text"
and the line preceeding
and the line after
So I would like a 3 line output for each line matched by grep
Is there a quick way to accomplish this?
Example--
FILE.DAT contains
abcdef
123456789
xyz
hijklmnop
987654321
I would like the search for "xyz" to yield results such as:
FILE.DAT:2: 123456789
FILE.DAT:3: xyz
FILE.DAT:4: hijklmnop
Any suggestions?
A Tagore
atagore2@juno.com
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LEARN ABOUT DEBIAN
digest::crc
Digest::CRC(3pm) User Contributed Perl Documentation Digest::CRC(3pm)
NAME
Digest::CRC - Generic CRC functions
SYNOPSIS
# Functional style
use Digest::CRC qw(crc64 crc32 crc16 crcccitt crc crc8 crcopenpgparmor);
$crc = crc64("123456789");
$crc = crc32("123456789");
$crc = crc16("123456789");
$crc = crcccitt("123456789");
$crc = crc8("123456789");
$crc = crcopenpgparmor("123456789");
$crc = crc($input,$width,$init,$xorout,$refout,$poly,$refin,$cont);
# add data to existing
$crc = crc32("ABCD", $crc);
# OO style
use Digest::CRC;
$ctx = Digest::CRC->new(type=>"crc16");
$ctx = Digest::CRC->new(width=>16, init=>0x2345, xorout=>0x0000,
refout=>1, poly=>0x8005, refin=>1, cont=>1);
$ctx->add($data);
$ctx->addfile(*FILE);
$digest = $ctx->digest;
$digest = $ctx->hexdigest;
$digest = $ctx->b64digest;
DESCRIPTION
The Digest::CRC module calculates CRC sums of all sorts. It contains wrapper functions with the correct parameters for CRC-CCITT, CRC-16,
CRC-32 and CRC-64, as well as the CRC used in OpenPGP's ASCII-armored checksum.
SEE ALSO
https://tools.ietf.org/html/rfc4880#section-6
AUTHOR
Oliver Maul, oli@42.nu
COPYRIGHT
CRC algorithm code taken from "A PAINLESS GUIDE TO CRC ERROR DETECTION
ALGORITHMS".
The author of this package disclaims all copyrights and releases it into the public domain.
perl v5.14.2 2011-11-12 Digest::CRC(3pm)