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How to compare two columns in two files?

 
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# 1  
Old 03-14-2016
How to compare two columns in two files?
Hi All,

I have a.dat file with content
Code:
1,338,30253395122015103,2015103,UB0085000,STMT151117055527002,,,
1,338,30253395122015103,2015103,UB0085000,STMT151117055527001,,,

and b.dat having content
Code:
1,STMT151117055527001,a1.txt,b1.txt,c1.txt
1,STMT151117055527002,a2.txt,b2.txt,c2.txt

Final output should be(compare 6th column of a.dat with 2nd column of b.dat if matches then update columns 7,8,9 of a.dat with the values of column 3,4,5 of b.dat )

Code:
1,338,30253395122015103,2015103,UB0085000,STMT151117055527002,a2.txt,b2.txt,c2.txt
1,338,30253395122015103,2015103,UB0085000,STMT151117055527001,a1.txt,b1.txt,c1.txt

Last edited by Don Cragun; 06-09-2016 at 02:30 AM.. Reason: Add CODE an ICODE tags.
# 2  
Old 03-14-2016
Please use code tags as required by forum rules!

Any attempts/ideas/thoughts from your side?
# 3  
Old 03-14-2016
I am using awk to resolve this but not able to match the column value from both the files.

If you have any idea please share !
# 4  
Old 03-14-2016
Why don't you show your attempts?
# 5  
Old 03-14-2016
Code:
awk 'NR==FNR{A[$2]=$1; B[$2]=$3; next} {$3=A[$1]; $4=B[$1]}1' FS=, OFS=, a.dat b.dat

Last edited by Don Cragun; 06-09-2016 at 02:31 AM.. Reason: Add CODE tags.
# 6  
Old 03-14-2016
You are on the right track, but
- the order of input files is wrong
- the array indices for the first file are OK, for the second, NOK
- Didn't you want to replace THREE fields?
- Didn't you want the trailing fields (7, 8, ...) to be replaced?
# 7  
Old 03-14-2016
Yes I want to replace 3 fields of file a.dat(7th,8th and 9th) which will be empty initially.
Can you please explain the code for this scenario ?
 
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