Filter on one column and then perform conditional calculations on another column with a Linux script Post: 302939508

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Top Forums Shell Programming and Scripting Filter on one column and then perform conditional calculations on another column with a Linux script Post 302939508 by Don Cragun on Thursday 26th of March 2015 04:37:06 AM

03-26-2015

Registered User

A few comments on your code:

There is no do ... while loop in awk.
I have no idea what you are trying to accomplish with the statement 3 tempMax=$2.
You can't have an array and a scalar variable with the same name: retransmissions[$1]=retransmissions.
If you have multiple statements to be processed in a loop, in an if, or in an else, you need to use braces ({ and }) to group those statements.
The expression ($3 in c) is meaningless when you haven't created any elements in an array named c[].
You don't calculate an average of n items by subtracting the lowest value from the highest value.
Using sort -u deletes duplicate entries. Deleting duplicate entries makes it impossible to calculate an average of all values for any given IP address, or for an IP address and sequence # pair.
A for(i in c) loop produces output in random (not necessarily sorted) order.

You didn't show what output you hope to produce from your sample input.

You talked about reporting the number of bytes transmitted, but there is nothing in your code that seems to try to capture or print that data. (And, the following script doesn't either.)

You seem to be trying to print the average time as a decimal number and the number of retransmissions as a floating point value printed with one decimal place. (Neither of these make any sense to me.)

So, making lots of wild guesses (ignoring the output your script seemed to be trying to produce), the following might help as a starting point for a script that will do what you want:

Code:

#!/bin/ksh
sort -k1,1 -k3,3n stats.txt | awk '
BEGIN {	printf("%17s %7s %s %s\n",
		"destIP", "seqNO", "AverageTime", "retransmissions")
	printf("----------------- ------- ----------- ---------------\n")
}
$1 != lIP || $3 != lSeqNo {
	if(NR != 1)
		printf("%17s %7d %11.3f %15d\n",
			lIP, lSeqNo, tTime / cnt, cnt - 1)
	if($1 == "destIP")
		exit
	lIP = $1
	tTime = $2
	lSeqNo = $3
	cnt = 1
	if(debug) printf("input: %s\nlIP=%s, lSeqNo=%d, tTime=%f, cnt=%d\n",
		$0, lIP, lSeqNo, tTime, cnt)
	next
}
{	tTime += $2
	cnt++
	if(debug)printf("input: %s\nlIP=%s, lSeqNo=%d, tTime=%f, cnt=%d\n",
		$0, lIP, lSeqNo, tTime, cnt)
}'

which, with the sample input you provided, produces the output:

Code:

           destIP   seqNO AverageTime retransmissions
----------------- ------- ----------- ---------------
          1.2.3.4     123       0.310               2
          1.2.3.4     124       0.620               1
          1.2.3.5      44       0.030               0
          1.2.3.5      45       0.830               0
          1.3.2.5      44       0.080               0

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