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Full Discussion: How to compare two columns in two files?
Top Forums UNIX for Dummies Questions & Answers How to compare two columns in two files? Post 302969029 by PRAMOD 96 on Thursday 17th of March 2016 08:24:33 AM
Old 03-17-2016
update file1 using file2 in awk
Hi all,
I have file a.dat with content
Code:
0,ID,,
1,001,2015060,UB0085000,Key2,abc,xyz
1,338,2015103,UB0085000,Key1,abc,xyz
1,338,2015103,UB0085000,Key5,abc,xyz
1,338,20017457,UB0085000,Key3,abc,xyz
1,338,20017457,UB0085000,Key4,abc,xyz
9,9,2016-03-17-09.03.13.131313

and file b.dat
Code:
1,Key1,a.txt,b.txt,c.txt
1,Key3,x.txt,y.txt,z.txt
1,Key5,p.txt,q.txt,r.txt
1,Key2,l.txt,m.txt,n.txt
1,Key4,j.txt,k.txt,l.txt
9,9,2016-03-17-09.03.13.131313

Final output should be(Print 1st and last line of a.dat as it is)
Code:
1,Key1,a.txt,b.txt,c.txt
1,Key3,x.txt,y.txt,z.txt
1,Key5,p.txt,q.txt,r.txt
1,Key2,l.txt,m.txt,n.txt
1,Key4,j.txt,k.txt,l.txt
9,9,2016-03-17-09.03.13.131313

Requirement :
I have to update file a.dat with help of b.dat having condition that search 4th column value of a.dat in b.dat. If matches then update column 6,7,8 of a.dat with the values of column 3,4,5 of b.dat and shift existing column 6,7,8 value
to next of a.dat

My Code :
Code:
awk 'NR==FNR{A[$2]=$3; B[$2]=$4; C[$2]=$5; next} {$6=A[$5]; $7=B[$5]; $8=C[$5]}1' FS=, OFS=, b.dat a.dat

My Output :
Code:
0,ID,,,,,,
1,001,2015060,UB0085000,Key2,l.txt,m.txt,n.txt
1,338,2015103,UB0085000,Key1,a.txt,b.txt,c.txt
1,338,2015103,UB0085000,Key5,p.txt,q.txt,r.txt
1,338,20017457,UB0085000,Key3,x.txt,y.txt,z.txt
1,338,20017457,UB0085000,Key4,j.txt,k.txt,l.txt
9,9,2016-03-17-09.03.13.131313,,,,,

Current Problem
1st and last line also get proccessed and contain many `,`
existing values of a.dat of column 6,7,8 is not shifting next.

Please suggest solution to this problem ..
Last edited by Don Cragun; 06-09-2016 at 02:37 AM.. Reason: Remove two duplicate posts, add CODE and ICODE tags, again.
 

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