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Full Discussion: Compare two csv files by two colums and create third file combining data from them.
Top Forums Shell Programming and Scripting Compare two csv files by two colums and create third file combining data from them. Post 302288051 by drl on Monday 16th of February 2009 10:26:38 AM
Old 02-16-2009
Hi.

You can also combine the first 2 fields to treat them as a single entity, use join (a sort is probably necessary), finally divide the first field into 2:
Code:
#!/usr/bin/env bash

# @(#) s2       Demonstrate join on 2 adjacent fields.

echo
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) sed join
set -o nounset
echo

FILE1=data1
FILE2=data2

echo " Data file $FILE1:"
cat $FILE1

echo
echo " Data file $FILE2:"
cat $FILE2

# Pre-process input / sort, join / post-process output.
echo
echo " Results:"
sed 's/ /_/' $FILE1 | sort -k1,1 >t1
sed 's/ /_/' $FILE2 | sort -k1,1 >t2

join -j 1 t1 t2 | sed 's/_/ /'

echo
echo " Expected output:"
cat expected-output.txt

exit 0

Producing:
Code:
$ ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: SunOS, 5.10, i86pc
GNU bash 3.00.16
sed - ( /usr/xpg4/bin/sed Aug 9 2005 )
join - ( /usr/bin/join Jan 22 2005 )

 Data file data1:
123 234 678 974 943
345 55 567 21 357
456 732 583 61 75

 Data file data2:
123 234 582 699 23 11 935
22 467 215 376 87 54
456 732 32 14

 Results:
123 234 678 974 943 582 699 23 11 935
456 732 583 61 75 32 14

 Expected output:
123 234 678 974 943 582 699 23 11 935
456 732 583 61 75 32 14

cheers, drl
 

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