Shell Scripting----Correction needed

I need a correction in my shell syntax (given below)

cat $dfn | gawk
'{for (i = 1; i <= NF; i += 1)
 {printf "%f\t", ((($i / $tag) / $bn ) */ 1000000000);}
 printf "\n"}'>fn

where $dfn is the file name $tag and $bn hold a value. and fn is the the file where output is being directed.

Note: what this line does, it takes a file name ( which is of n by m dimension and contains a value in each cell) divides each 开发者_运维知识库value in the cell by the value in $tag variable answer of this is divided again by the value in $bn and finally after all division operations are performed the value is multiplied by 1 billion.

Thank you in advance.

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The variables $tag and $bn are referring to fields in the lines. I'm assuming you actually want them to be environment variables. Pass them as variables to awk:

cat $dfn | 
    gawk -v tag="$tag" -v bn="$bn" '{
      for (i = 1; i <= NF; i += 1) {
        printf "%f\t", ((($i / tag) / bn ) * 1000000000)
      }
      printf "\n"
    }'>fn

Edit: Also fix the multiplication as indicated by Raghuram.

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I think you shuld change the /* to * when you mutiply the value by 1 Billion.