How to Add Column with Percentage

Question

I would like to calculate percentage of value in each line out of all lines and add it as another column. Input (delimiter is \\t):

1   10      
2   10
3   20
4          


        

Answer 1

You need to escape it as %%. For instance:

printf("%s\t%s\t%s%%\n", $1, $2, $3)