Grep a pattern in a key position a file Post: 303017729

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Search for a pattern and replace a space at specific position with a Character in File

In file, we have millions of records each of 1000 in length. And at specific position say 800 there is a space, we need to replace it with Character X if the ID in that row starts with 123. So far i have used the below which is replacing space at that position to X but its not checking for...

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flowtop

flowtop(8)							netsniff-ng-toolkit							flowtop(8)

NAME

       flowtop - provide top-like netfilter connection tracking information

SYNOPSIS

       flowtop [--city-db <path>][--country-db <path>] [-T|--tcp][-U|--udp][-v|--version][-h|--help]

DESCRIPTION

       flowtop is a tiny tool to print human-readable netfilter connection tracking information.

EXAMPLES

       flowtop
	   Show only TCP flows

       flowtop --udp
	   Show only UDP flows

       flowtop --city-db /usr/share/GeoIP/GeoIPCity.dat
	   Use the specified GeoIP city database

       flowtop --country-db /usr/share/GeoIP/GeoIP.dat
	   Use the specified GeoIP country database

OPTIONS

       -T|--tcp
	   Only show TCP flows (default)

       -U|--udp
	   Only show UDP flows

       -s|--show-src
	   Also include flow source in top output

       --city-db
	   Path to GeoIP city database

       --country-db
	   Path to GeoIP country database

       -v|--version
	   Print version.

       -h|--help
	   Print help text and lists all options.

AUTHOR

       Written by Daniel Borkmann <daniel@netsniff-ng.org>

DOCUMENTATION

       Documentation by Emmanuel Roullit <emmanuel@netsniff-ng.org>

BUGS

       Please report bugs to <bugs@netsniff-ng.org>

								    2012-06-29								flowtop(8)

10 More Discussions You Might Find Interesting

1. Solaris

Unusual error : KEY in LOCKED position ignoring debug enter sequence

Discussion started by: sacrh

2. Shell Programming and Scripting

How to awk/sed/grep lines which contains a pattern at a given position

Discussion started by: anoopvraj

3. UNIX for Dummies Questions & Answers

Grep a pattern in gz file

Discussion started by: rprajendran

4. UNIX for Dummies Questions & Answers

Grep in a file for a particular pattern in a particular position witihn the file

Discussion started by: ABE2202