Shell Programming and Scripting

FNR
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.

NR
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.

comm -12 file1 file2

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

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
1,96,83.8,13.9667

$ cat match.txt
1,101,0.9,0.366667
1,3,0.9,0.2
1,97,3.8,1.05
1,98,10.9,0.473464
1,99,10.6,0.468
2,101,0.2,0.2
2,24,4.4,0.255952
2,25,39.9,0.901191
2,26,64.4,1.3314