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Full Discussion: Merge columns from two files using awk
Top Forums Shell Programming and Scripting Merge columns from two files using awk Post 302978960 by Scrutinizer on Sunday 7th of August 2016 05:16:02 AM
Old 08-07-2016
RudiC has given you some good pointers to how you could solve your problem. This kind of problem is posted here frequently. What makes this problem stand out is the imperfections in the input files. b.csv contains spurious leading/trailing spaces in multiple fields, which will likely mess up the results.

So this can be fixed by getting rid of the space before storing and comparing, but also storing the imperfections, so they are not altered in the process:

Code:
awk '{r=$0; for(i=1; i<=NF; i++) gsub(/^ +| +$/,x,$i)} NR==FNR{A[$1,$2]=$3; next} {print r, A[$1,$2]}' FS=, OFS=, a.csv b.csv

Whereas with a proper input file, something like this would suffice:
Code:
awk 'NR==FNR{A[$1,$2]=$3; next} {print $0, A[$1,$2]}' FS=, OFS=,  a.csv b.csv

These approaches can be further augmented by first testing if a field pair is present in the other file..
 

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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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