compare two files using awk


 
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# 1  
Old 11-02-2009
compare two files using awk

Hi,

I want to compare two files using awk and write an output based on if the records matched.

Both the files are space delimitted.

File A:
Code:
8351 00000000000636 2009044 -00001.000
8351 00000000000637 2009044 -00002.000
8351 00000000000638 2009044 -00001.000
8351 00000000000640 2009044 -00003.000
8351 00000000000642 2009044 -00001.000
8351 00000000000650 2009044 -00001.000

File B:

Code:
8351 00000000000636 006
8351 00000000000637 002
8351 00000000000642 001

Output:
Code:
006 8351 00000000000636 2009044 -00001.000
002 8351 00000000000637 2009044 -00002.000
000 8351 00000000000638 2009044 -00001.000
000 8351 00000000000640 2009044 -00003.000
001 8351 00000000000642 2009044 -00001.000
000 8351 00000000000650 2009044 -00001.000

Basically, if the second column of File A matches with the second column of File B. I need to write the third column of file B and the complete line from File A.

If not matched I need to write 000 and then the complete line in File A.

I tried some awk commands.. but didnt work. This below code i wrote to get the matched record and write the third column and the file A. But the third column is not getting written.

Any help will be much appreciated.

Code:
awk '
NR==FNR{a[$2]=$2;next}
a[$2]{print a[$3] $0}' $ZEROSTOCK $INFILE > $INTEMP


Last edited by vgersh99; 11-02-2009 at 05:54 PM.. Reason: code tags, please!
# 2  
Old 11-02-2009
Code:
awk '
  FNR==NR { fb[$2]=$3; next}
  { print (($2 in fb)? fb[$2] : "000"), $0 }
' fileB fileA


Last edited by vgersh99; 11-02-2009 at 07:57 PM.. Reason: ooops - missed the '000' requirement
# 3  
Old 11-02-2009
Code:
awk 'NR==FNR{a[$2]=$3;next}{if (a[$2]) printf a[$2]" "; else printf "000 "}1' zerostock infile

Code:
006 8351 00000000000636 2009044 -00001.000
002 8351 00000000000637 2009044 -00002.000
000 8351 00000000000638 2009044 -00001.000
000 8351 00000000000640 2009044 -00003.000
001 8351 00000000000642 2009044 -00001.000
000 8351 00000000000650 2009044 -00001.000


Last edited by Scrutinizer; 11-02-2009 at 06:16 PM..
# 4  
Old 11-02-2009
Would you mind explaining the script? why fb[$2]=$3 instead of $2?? I didnt actually get that part.
# 5  
Old 11-02-2009
The key that needs to be stored is $2 and the value is $3 of the zerostock input file.
# 6  
Old 11-02-2009
This worked. Thanks a lot.

Quote:
Originally Posted by Scrutinizer
Code:
awk 'NR==FNR{a[$2]=$3;next}{if (a[$2]) printf a[$2]" "; else printf "000 "}1' zerostock infile

Code:
006 8351 00000000000636 2009044 -00001.000
002 8351 00000000000637 2009044 -00002.000
000 8351 00000000000638 2009044 -00001.000
000 8351 00000000000640 2009044 -00003.000
001 8351 00000000000642 2009044 -00001.000
000 8351 00000000000650 2009044 -00001.000

# 7  
Old 11-02-2009
I realize you asked about awk, but Unix "join" is also a good way to sart something like this.

For this case,

Code:
 join -1 1 a b

gives output like

Quote:
8351 00000000000636 2009044 -00001.000 00000000000636 006
8351 00000000000636 2009044 -00001.000 00000000000637 002
8351 00000000000636 2009044 -00001.000 00000000000642 001
8351 00000000000637 2009044 -00002.000 00000000000636 006
8351 00000000000637 2009044 -00002.000 00000000000637 002
8351 00000000000637 2009044 -00002.000 00000000000642 001
...
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