Merging two text files by two columns


 
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# 1  
Merging two text files by two columns

Hi,

I have two text files that I would like to merge/join. I would like to join them if the first columns of both text files match and the second column of the first text file matches the third column of the second text file.

Example input:
First file:
Code:
1334 10 0 0 1 5.2
1334 12 0 0 1 4.5
1340 9 0 0 1 5.6
1340 11 0 0 1 3.5

Second file
Code:
1334 14 10 0 2 5.5
1341 2 13 14 2 5.6
1341 13 0 0 1 5.5
1340 8 11 0 1 5.6
1340 10 0 0 2 5.5

Output file:
Code:
1334 10 0 0 1 5.2 1334 14 10 0 2 5.5
1340 11 0 0 1 3.5 1340 8 11 0 1 5.6

Thanks!

Last edited by Corona688; 03-06-2012 at 02:38 PM.. Reason: Code tags
# 2  
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# 3  
Code:
$ awk 'NR==FNR{D[$1]=$0}; (NR!=FNR) && D[$1] && (!S[$1]++) { print D[$1], $0 }' file1 file2

1334 12 0 0 1 4.5 1334 14 10 0 2 5.5
1340 11 0 0 1 3.5 1340 8 11 0 1 5.6

$

# 4  
The output is not exactly what I want. I want to the first column of the first file to match the first column of the second file, as well as the second column of the first file to match the third column of the second file. Thanks!
# 5  
Code:
$ awk 'NR==FNR { C[$1]++; L[$1, C[$1]]=$0; D[$1, C[$1]]=$2 ; next }
C[$1] { for(N=1; N<=C[$1]; N++) if(D[$1, N]==$3) print L[$1, N], $0 }' file1 file2

1334 10 0 0 1 5.2 1334 14 10 0 2 5.5
1340 11 0 0 1 3.5 1340 8 11 0 1 5.6

$

 

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