Awk Notes

I love you awk

standard deviation with awk

    awk '{for(i=1;i<=NF;i++) {sum[i] += $i; sumsq[i] += ($i)^2}} 
          END {for (i=1;i<=NF;i++) {
          printf "%f %f \n", sum[i]/NR, sqrt((sumsq[i]-sum[i]^2/NR)/NR)}
         }' file.dat >> aver-std.dat

where file.dat is one column of numbers.