Shell Programming and Scripting

Hi everyone, just some simple question...

i've been using a awk script to calculate my data...

i have 3 files:

file a1.txt:

Code:

2
3
4
5
3
4

file a2.txt:

Code:

4
5
6
7
8

file a3.txt:

Code:

2
5
1
3
4

i successfully calculate the average of each file using awk:

Code:

awk '{ s += $1 } END { print s/NR }' a1.txt
awk '{ s += $1 } END { print s/NR }' a2.txt
awk '{ s += $1 } END { print s/NR }' a3.txt

the results were (3.5, 6 and 3) which is pretty easy..

now i want to combine all this into 1 file and each have different columns and called it avg.txt which have something like this in the end:

Code:

3.5 6 3

help is much appreciated, Tq

Code:

nawk '
{ A[FILENAME]+=$1; N[FILENAME]++ }
END { for ( i in A ) { REC=REC A[i]/N[i]" " }
        print REC } ' a1.txt a2.txt a3.txt