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Full Discussion: How big is my awk array?
Top Forums Shell Programming and Scripting How big is my awk array? Post 302135540 by Klashxx on Monday 10th of September 2007 12:40:49 PM
Old 09-10-2007
You're completely right vgersh99 ,but i thought the other piece was more clear for this particular case.

pondlife , you 're using an associative array ,where the index is the 10th element of your input and its value is a counter ,the number of times that the element is repeated.

Each element of the index is unique , so the first time you add a new entry to the array (new index) its counter value wil be 1
Code:
per[$10] = 1

On the other hand if the index exits the only variation will be the increase of the value of the counter so:
Code:
per[$10] >1

finally we can say that:

Code:
   if ( per[$10] == 1 )
      c++

Or:
Code:
if ( !($10 in per) ) c++

indicates that a new element was added to the array.

Hope this helps.

Regards
Last edited by Klashxx; 09-10-2007 at 02:45 PM..
 

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LEARN ABOUT DEBIAN

ifpps

ifpps(8)							netsniff-ng-toolkit							  ifpps(8)

NAME

       ifpps - fetch and format kernel network statistics

SYNOPSIS

       ifpps	 -d|--dev <netdev> [-t|--interval <sec>][-p|--promisc][-c|--term]
	    [-C|--csv][-H|--csv-tablehead][-l|--loop][-v|--version][-h|--help]

DESCRIPTION

       A tiny tool to provide top-like reliable networking statistics.	ifpps reads out the 'real' kernel statistics, so it does not give
       erroneous statistics on high I/O load.

OPTIONS

       ifpps --dev eth0
	   Fetch eth0 interface statistics.

       ifpps --dev eth0 --interval 60 --csv
	   Output eth0 interface statistics every minute in CSV format.

OPTIONS

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

       -v|--version
	   Print version.

       -d|--dev <netdev>
	   Device to fetch statistics for i.e., eth0.

       -p|--promisc
	   Put the device in promiscuous mode

       -t|--interval <time>
	   Refresh time in sec (default 1 sec)

       -c|--term
	   Output to terminal

       -C|--csv
	   Output in CSV format.  E.g. post-processing with Gnuplot et al.

       -H|--csv-tablehead
	   Print CSV table head.

       -l|--loop
	   Loop terminal output.

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								  ifpps(8)
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