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Top Forums Shell Programming and Scripting Grep starting from a specific position Post 302537383 by Lord Spectre on Friday 8th of July 2011 03:28:41 AM
Old 07-08-2011
Grep starting from a specific position

Hello people,
I'm scratch my head to find a solution to my problem, I'm absolutely sure this is very simple!!! Smilie

I'm using the tcpdump to show on the screen in real time the UCP traffic:
Code:
tcpdump -l -i bond1 -s 1514 -nntttt -A src or dst 192.168.1.5 and port 10000 | egrep "/51/"

The output will be something like:
Code:
a..'....P.o....P..E.....01/00246/O/51/001234567889/1234567890//1//7///////0907110916.........
a..'....P.....nP..fE....02/00248/O/51/001234567889/1234567890//1//7///////0907110916.........
a..'....P......P..CF....03/00244/O/51/001234567889/1234567890//1//7///////0907110916.........

Now, the first chars (coming from TCP stack) is always different, but have always the same lenght (24 chars).

Is there a way to remove that chars adding a filter directly to the primary command??
Like starting output from 25th char and show on the screen something like: ?
Code:
01/00246/O/51/001234567889/1234567890//1//7///////0907110916.........
02/00248/O/51/001234567889/1234567890//1//7///////0907110916.........
03/00244/O/51/001234567889/1234567890//1//7///////0907110916.........

And also, is it possible to have a CR between each lines, like:
Code:
01/00246/O/51/001234567889/1234567890//1//7///////0907110916.........

02/00248/O/51/001234567889/1234567890//1//7///////0907110916.........

03/00244/O/51/001234567889/1234567890//1//7///////0907110916.........

Thanks!

Last edited by Lord Spectre; 07-08-2011 at 04:39 AM..
 

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Locale::Codes::LangVar(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangVar(3pm)

NAME
Locale::Codes::LangVar - standard codes for language variation identification SYNOPSIS
use Locale::Codes::LangVar; $lvar = code2langvar('acm'); # $lvar gets 'Mesopotamian Arabic' $code = langvar2code('Mesopotamian Arabic'); # $code gets 'acm' @codes = all_langvar_codes(); @names = all_langvar_names(); DESCRIPTION
The "Locale::Codes::LangVar" module provides access to standard codes used for identifying language variations, such as those as defined in the IANA language registry. Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language registry codes will be used. SUPPORTED CODE SETS
There are several different code sets you can use for identifying language variations. A code set may be specified using either a name, or a constant that is automatically exported by this module. For example, the two are equivalent: $lvar = code2langvar('en','alpha-2'); $lvar = code2langvar('en',LOCALE_CODE_ALPHA_2); The codesets currently supported are: alpha This is the set of alphanumeric codes from the IANA language registry, such as 'arevela' for Eastern Armenian. This code set is identified with the symbol "LOCALE_LANGVAR_ALPHA". This is the default code set. ROUTINES
code2langvar ( CODE [,CODESET] ) langvar2code ( NAME [,CODESET] ) langvar_code2code ( CODE ,CODESET ,CODESET2 ) all_langvar_codes ( [CODESET] ) all_langvar_names ( [CODESET] ) Locale::Codes::LangVar::rename_langvar ( CODE ,NEW_NAME [,CODESET] ) Locale::Codes::LangVar::add_langvar ( CODE ,NAME [,CODESET] ) Locale::Codes::LangVar::delete_langvar ( CODE [,CODESET] ) Locale::Codes::LangVar::add_langvar_alias ( NAME ,NEW_NAME ) Locale::Codes::LangVar::delete_langvar_alias ( NAME ) Locale::Codes::LangVar::rename_langvar_code ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangVar::add_langvar_code_alias ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangVar::delete_langvar_code_alias ( CODE [,CODESET] ) These routines are all documented in the Locale::Codes::API man page. SEE ALSO
Locale::Codes The Locale-Codes distribution. Locale::Codes::API The list of functions supported by this module. http://www.iana.org/assignments/language-subtag-registry The IANA language subtag registry. AUTHOR
See Locale::Codes for full author history. Currently maintained by Sullivan Beck (sbeck@cpan.org). COPYRIGHT
Copyright (c) 2011-2013 Sullivan Beck This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.18.2 2014-01-06 Locale::Codes::LangVar(3pm)
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