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awk math operation on two files

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# 1  
Old 03-15-2012
awk math operation on two files
Hi, I need your help. I've got two files and i need to add 2nd line after occurrence of "Group No X" from data2.txt to 3rd line (after occurrence of "Group No X") from data1.txt. There is the same number of "Groups" in both files and the numbers of groups have the same pattern.
data1.txt
Code:
Group No 1
23           23             
24           24    
25           25             
26           26             
27           27             
Group No 2
13           13             
14           14             
15           15             
16           16             
17           17
Group No 3
3             3             
4             4             
5             5             
6             6             
7             7

data2.txt
Code:
Group No 1
1000             1000             
2000             2000             
3000             3000             
Group No 2
100               100
200               200
300               300
Group No 3
10000           10000
20000           20000
30000           30000

I need to get output that looks like:
Code:
Group No 1
23             23
24             24             
2025         2025             
26             26             
27             27                
Group No 2
13             13             
14             14             
215           215             
16             16             
17             17             
Group No 3
3               3             
4               4             
20005       20005             
6               6             
7               7

# 2  
Old 03-16-2012
Could this help you ?

Code:
 
 awk 'NR==FNR{if(/^Group/){g=$3;i=1;next}if(i==2){a[g]=$1}i++;next}
{if(/^Group/){k=$3;j=1;print;next}if(j==3){$1+=a[k];$2+=a[k]}print;j++}' data2.txt data1.txt

This User Gave Thanks to pravin27 For This Post:
killerbee
# 3  
Old 03-17-2012
Thanks, it works! Could you please post a short description of this? I will be grateful.
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