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Top Forums Shell Programming and Scripting Extract data from large file 80+ million records Post 302321975 by learner16s on Tuesday 2nd of June 2009 12:41:08 PM
Old 06-02-2009
Extract data from large file 80+ million records

Hello,

I have got one file with more than 120+ million records(35 GB in size). I have to extract some relevant data from file based on some parameter and generate other output file.

What will be the besat and fastest way to extract the ne file.

sample file format :--
++++++7777jjjjjjj0000000000 ( header record)
2098 POCG 0000 KKKK
2097 KOLL 0F00 KLLL
2095 LKJH 0L99 L0IU
.
.
.
.

********66666666666**** ( trailer record

Now suppose i enter the key as 2098(field as key) , so all rercords with 2098 as the first record should be moved to new file.

**********************************************

I tried to use grep ...but it took a lot of time ..nearly 45 mintues to give me output file.
 

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INTERFACE-ORDER(5)						    resolvconf							INTERFACE-ORDER(5)

NAME
interface-order - resolvconf configuration file DESCRIPTION
The file /etc/resolvconf/interface-order is used to control the order in which resolvconf nameserver information records are processed by those resolvconf update scripts that consult this file. (The name of the file is apt because a resolvconf nameserver information record is named after the interface with which it is associated.) The file contains a sequence of shell glob patterns, one per line. The position of a record in the order is the point at which its name first matches a pattern. Patterns may not contain whitespace, slashes or initial dots or tildes. Blank lines and lines beginning with a '#' are ignored. Resolvconf update scripts in /etc/resolvconf/update.d/ that consult this file include the current default versions of dnsmasq, pdnsd and libc. (Actually they don't read the file directly; they call the utility program /lib/resolvconf/list-records which lists records in the specified order and omits the names of empty records.) EXAMPLE
# /etc/resolvconf/interface-order # Use nameservers on the loopback interface first. lo* # Next use records for Ethernet interfaces eth* # Next use records for Wi-Fi interfaces wlan* # Next use records for PPP interfaces ppp* # Last use other interfaces * AUTHOR
Resolvconf was written by Thomas Hood <jdthood@gmail.com>. COPYRIGHT
Copyright (C) 2004, 2011 Thomas Hood This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
resolvconf(8) resolvconf 18 May 2011 INTERFACE-ORDER(5)
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