Match columns and print specific field

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# 1  
Old 11-07-2014
Match columns and print specific field


I have data in following format.


Now I want to print "slim" value for "main,FRONTEND" or "ereq" value for "apache2,elb4" or process data in similar fashion. I tried below command but it prints entire column.
#awk -F, '/main,FRONTEND/{print}' socat.txt

it prints entire line which has around 51 fields, among that one value carries "slim" field value.I dont know field number of "slim". I want to print "slim" value of "main,FRONTEND" column. Giving field number to awk can work but since there are lots of fields and elbs I dont want to use that option.


Last edited by Franklin52; 11-07-2014 at 06:59 AM.. Reason: Please use code tags
# 2  
Old 11-07-2014
awk -F ',' 'NR == 1{for(i=1; i<=NF; i++) a[$i] = i; next}
 /^main,FRONTEND/ {print $(a["slim"])}
 /^apache2,elb4/ {print $(a["ereq"])}' socat.txt

This User Gave Thanks to SriniShoo For This Post:
# 3  
Old 11-07-2014
Thanks Srini, Its working fine Smilie
I have one query, What needs to be done if I have to send matching strings as a variable to same awk command. My variable would be like mentioned below

These variable will be set in shell script and awk will refer it accordingly.
How do I integrate these variable into the same command which you have provided.

Thanks Again,


Last edited by Franklin52; 11-07-2014 at 06:59 AM.. Reason: Please use code tags
# 4  
Old 11-07-2014
awk -F ',' 'NR == 1{for(i=1; i<=NF; i++) a[$i] = i; next}
 $0 ~ "^" proxy {print $(a[field])}' proxy="main,FRONTEND" field="slim" socat.txt

This User Gave Thanks to SriniShoo For This Post:
# 5  
Old 11-07-2014
Thanks, code is working fine. Now I am facing another issue with exact string match.
if my variable value is "apache2,elb1" and the file contains lines like "apache2,elb1" "apache2,elb11" "apache2,elb12"
In this case code fetching values for all the 3 lines rather than just "apache2,elb1"

# 6  
Old 11-07-2014
Please use code tags as required by forum rules!

Try (untested): $0 ~ "^" proxy FS {...
This User Gave Thanks to RudiC For This Post:
# 7  
Old 11-07-2014
Thanks, It worked Smilie Smilie
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