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# 1  
Old 09-04-2016
awk - read only part of a field
I have an awk command which reads a file and counts the frequency of each "date/time" column and outputs the results to a log

Code:
# if field7 is "input_message" in the input log
# count frequency of the field4 date and time field then print out totals to log 
awk ' $7=="input_message"{A[$4]++}END {for(i in A)print i","A[i]","}' $IN_FILE >> $OUTPUT_LOG ;

The $IN_FILE input file looks like this
Code:
31.44.217.2 - A [02/Sep/2016:09:44:52 +0100] "POST input_message HTTP" 200 -  
31.44.217.2 - A [02/Sep/2016:09:44:52 +0100] "POST input_message HTTP" 200 -  
31.44.217.2 - A [02/Sep/2016:09:44:53 +0100] "POST input_message HTTP" 200 -  
31.44.217.2 - A [02/Sep/2016:09:45:01 +0100] "POST input_message HTTP" 200 -  
31.44.218.2 - A [02/Sep/2016:09:50:52 +0100] "POST input_message HTTP" 200 -

The $OUTPUT_LOG output file looks like this and gives a total count of the frequency of each date/time field
Code:
[02/Sep/2016:09:44:52,2,
[02/Sep/2016:09:44:53,1,
[02/Sep/2016:09:45:01,1,
[02/Sep/2016:09:50:52,1,

I would like to change it so it counts 10 minute time frames e.g instead of reading $4 as [02/Sep/2016:09:44:52 it reads it as [02/Sep/2016:09:4 (ignore 4:52 at the end).

This would then output counts for the 10 minute period as opposed to counts of every second. I'm trying to figure out how to ignore the last 4 characters of $4 to do this.

Any help appreciated.
Last edited by finn; 09-04-2016 at 05:40 AM.. Reason: better title
# 2  
Old 09-04-2016
Hello finn,

Could you please try following and let me know if this helps.
Code:
awk '{A[substr($4,2,16)]++} END{for(i in A){print i "," A[i] ","}}'  Input_file

Output will be as follows.
Code:
02/Sep/2016:09:4,4,
02/Sep/2016:09:5,1,

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
finn
# 3  
Old 09-04-2016
Spot on many thanks Ravinder!
# 4  
Old 09-05-2016
Wouldn't it be nicer to print the full minutes and seconds as well, to make the time recognizeable:
Quote:
awk '{A[substr($4,2,16)]++} END{for(i in A){print i "0:00," A[i] ","}}' file3
02/Sep/2016:09:50:00,1,
02/Sep/2016:09:40:00,4,
This User Gave Thanks to RudiC For This Post:
finn
# 5  
Old 09-05-2016
Good idea thanks, I noticed when opening the resultant output file in Excel it didnt auto format the time correctly and the column need a custom format doing. Doing your suggestion will mean that is not necessary. Cheers.
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