UNIX for Dummies Questions & Answers

ID,field1,field2,field3,field4
A,5,6,7,8
B,1,2,3,4
C,3,5,6,7

ID,field1,field2,field3,field4
A,2.32,2.58,2.8,3 
B,0,1,1.58,2
C,1.58,2.32,2.58,2.8

awk -F"," '{print log($2)/log2}' input.csv > output.csv

awk -F, ' NR == 1 {
                print
} NR > 1 {
                printf $1
                for(i = 2; i <= NF; i++)
                        s = s OFS log($i)/log(2)
                print s
                s = ""
}' OFS=, input.csv

awk -F, 'FNR>1{for(i=2;i<=NF;i++) $i=log($i)/log2}1' OFS=, CONVFMT='%.2f' myFile

awk -F, 'FNR>1{for(i=2;i<=NF;i++) $i=log($i)/log(2)}1' OFS=, CONVFMT='%.4f' myFile