Add fields in different files only if some fields between them match

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# 8  
Old 06-06-2011
The current record number in the current file. FNR is incremented each time a new record is read (see Getline). It is reinitialized to zero each time a new input file is started.

The number of input records awk has processed since the beginning of the program's execution (see Records). NR is incremented each time a new record is read.

So with that, when NR==FNR, it limits the operation in first file ( in this case, it is file1)
# 9  
Old 06-06-2011
only one last thing. there is a way to get the lines that do not match (send them to another output file) with a modified version of that awk script or is better to do
comm -12 file1 file2


---------- Post updated at 04:39 PM ---------- Previous update was at 12:52 AM ----------

comm does not work, because the order is not the same
# 10  
Old 06-06-2011
You will get file "not.match.txt" automatically.

awk 'NR==FNR{a[$1 FS $2]=$3;b[$1 FS $2]=$4;next}
    { if (a[$1 FS $2]!="") {$3=a[$1 FS $2]+$3; $4=b[$1 FS $2]+$4;print} 
      else {print > "not.match.txt" }
    }' FS=, OFS=, file1 file2

If you'd like to print into two files with matched and not matched directly:

awk 'NR==FNR{a[$1 FS $2]=$3;b[$1 FS $2]=$4;next}
    { if (a[$1 FS $2]!="") {$3=a[$1 FS $2]+$3; $4=b[$1 FS $2]+$4;print > "match.txt"} 
      else {print > "not.match.txt" }
    }' FS=, OFS=, file1 file2

$ cat not.match.txt

$ cat match.txt

This User Gave Thanks to rdcwayx For This Post:
# 11  
Old 06-07-2011
great!! last (truly..) thing..
can that be generalised..for n files....n could be 2, 3, 5, 6, 7, or 10... just to know...

man.. I owe u a beer whenever u wantSmilie

I will learn awk!Smilie
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