Awk incorrect data.

pinnacle · #1 (**permalink**) 04-21-2009

I am using the following command:

Code:

nawk -F"," 'NR==FNR {a[$2$3]=$1;next} a[$2$3] {print a[$2$3],$1,$2,$3}'  file1 file2

I am getting 40 records output.
But when i import file1 and file2 in MS Access i get 140 records.
And i know 140 is correct count.

Appreciate your help on correcting the above script

vgersh99 · #2 (**permalink**) 04-21-2009

It would definitely help if you provided a more detailed description of what you're trying to achieve with the sample data files and the expected output.

My crystal ball is a bit fuzzy, but:

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=, file1 file2

pinnacle · #3 (**permalink**) 04-21-2009

Quote:

Originally Posted by vgersh99

It would definitely help if you provided a more detailed description of what you're trying to achieve with the sample data files and the expected output.

My crystal ball is a bit fuzzy, but:

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=, file1 file2

vgersh99

I have two files
$ head file1
zip,FirstName,Lastname
07777,abc,def
22584,dec,dlo
25487,xyz,jkl
25488,dim,kio

$ head file2
aim server database
SSN,Firstname,LastName
123456789,abc,def
123456789,dec,dlo
123456789,xyz,jkl
123456789,dim,kio
wanted Output:
SSN,zip,FirstName,LastName

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=,  " file2 file1
40 Matches

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=,  " file1 file2
140 matches

140 matches is correct i know but both should give 140 i dont know why its giving difference.

Can you please explain this part ($2 SUBSEP $3)
a[$2,$3] we are using , here because its is comma seperated inputfile or is it general rule
If i dont use , then also i am getting same result

vgersh99 · #4 (**permalink**) 04-21-2009

Quote:

Originally Posted by zenith

vgersh99

I have two files
$ head file1
zip,FirstName,Lastname
07777,abc,def
22584,dec,dlo
25487,xyz,jkl
25488,dim,kio

$ head file2
aim server database
SSN,Firstname,LastName
123456789,abc,def
123456789,dec,dlo
123456789,xyz,jkl
123456789,dim,kio
wanted Output:
SSN,zip,FirstName,LastName

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=,  " file2 file1
40 Matches

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=,  " file1 file2
140 matches

The above 2 invocations are exactly the same. I don't understand why you're getting different results.
Also I don't understand why you have a trailing double quote (in red) in both case?

Quote:

Originally Posted by zenith

140 matches is correct i know but both should give 140 i dont know why its giving difference.

Can you please explain this part ($2 SUBSEP $3)
a[$2,$3] we are using , here because its is comma seperated inputfile or is it general rule
If i dont use , then also i am getting same result

No, it's not because your file is comma-separated. You can build your array index just by concatenating the strings ($2$3) or (which is better for further processing) by doing this:

Code:

a[$2,$3]

In the context of the array index building, the "," is substituted by the awk's internal variable SUBSEP. If later on you decide to "split" the index (to find it parts) you can split by SUBSEP. If you simply concatenate the string, you cannot reconstruct the index to its original parts.

The originally posted solution should give you the desired result.
Given file1:

Code:

zip,FirstName,Lastname
07777,abc,def
22584,dec,dlo
25487,xyz,jkl
25488,dim,kio

and file2:

Code:

SSN,Firstname,LastName
123456789,abc,def
123456789,dec,dlo
123456789,xyz,jkl
123456789,dim,kio

running:

Code:

nawk -F, 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=, file2 file1

Results in:

Code:

123456789,07777,abc,def
123456789,22584,dec,dlo
123456789,25487,xyz,jkl
123456789,25488,dim,kio

Check your file1 and file2 - see if there're any discrepancies and/or embedded spaces.

Also, this is NOT one of your first forum posts and you've been asked in the past: please use BB Code tags when posting data or code samples.

pinnacle · #5 (**permalink**) 04-21-2009

Quote:

Originally Posted by vgersh99

The above 2 invocations are exactly the same. I don't understand why you're getting different results.
Also I don't understand why you have a trailing double quote (in red) in both case?

No, it's not because your file is comma-separated. You can build your array index just by concatenating the strings ($2$3) or (which is better for further processing) by doing this:

Code:

a[$2,$3]

In the context of the array index building, the "," is substituted by the awk's internal variable SUBSEP. If later on you decide to "split" the index (to find it parts) you can split by SUBSEP. If you simply concatenate the string, you cannot reconstruct the index to its original parts.

The originally posted solution should give you the desired result.
Given file1:

Code:

zip,FirstName,Lastname
07777,abc,def
22584,dec,dlo
25487,xyz,jkl
25488,dim,kio

and file2:

Code:

SSN,Firstname,LastName
123456789,abc,def
123456789,dec,dlo
123456789,xyz,jkl
123456789,dim,kio

running:

Code:

nawk -F, 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=, file2 file1

Results in:

Code:

123456789,07777,abc,def
123456789,22584,dec,dlo
123456789,25487,xyz,jkl
123456789,25488,dim,kio

Check your file1 and file2 - see if there're any discrepancies and/or embedded spaces.

Also, this is NOT one of your first forum posts and you've been asked in the past: please use BB Code tags when posting data or code samples.

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=, file1 file2

In the above code if i switch the file1 and fie2 position then i get different results.
I cannot post the files due to data sensitivity.
I visually checked the files and i see no special characters or anything.
Is there a special command to verify this.

Appreciate your response.

vgersh99 · #6 (**permalink**) 04-22-2009

Quote:

Originally Posted by zenith

Code:

nawk -F"," 'NR==FNR {a[$2,$3]=$1;next} ($2 SUBSEP $3) in a {print a[$2,$3],$1,$2,$3}'  OFS=, file1 file2

In the above code if i switch the file1 and fie2 position then i get different results.
I cannot post the files due to data sensitivity.
I visually checked the files and i see no special characters or anything.
Is there a special command to verify this.

Appreciate your response.

Patient: Doc, it really hurts when I do that!
Doctor: Then don't do that!

The positions of the files on the command line is important for mapping the fields from one file to the other. Look at your data files' fields - try to see the difference and look at your original posting for the mapping logic.
Good luck.

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