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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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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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