Question

How to calculate the average in linux?

I have a file like this:
ID          Math       Sci        Eng         Average
230          70         -          50
123          50         50         60
223          -          80         90

I need the output like this:

ID          Math       Sci        Eng         Average
230          70         -          50            60
123          50         50         60            53.33
223          -          80         90            85

I am using this code, but I am only able to get the total:

awk '/^[0-9]/ {for (i=2; i<=NF; i++) {tot+=$i}; avg=tot/cnt[i]; print $1 "\t" avg}'

I calculated total using the above; and thought that I will be able to count the no. but its giving me an error .. Please help me, I am new to this field .. Thanks 🙂

Answer 1

awk '/^[0-9]/ {
    tot = 0; 
    count = 0; 
    for (i = 2; i <= NF; i++) {
        to += $i; 
        if($i + 0 == $i){
           count++;
        }
    }
    avg = tot/count; 
    print $0,avg; 
}'

Might be better to put it into a script.