Re: modify data at a specific line and columns

> 3. Without a better idea of what defines a "column", it is difficult
> to solve your task.

$#  nrcyck     drtol    drfctr    drterm    tssfdr    irelal
edttl    idrflg
       250  0.001000  0.995000     0.000     0.000         0  0.040000
*CONTROL_ENERGY
$#    hgen      rwen    slnten     rylen
         2         2         2         2


this is an excerpt from the file. above is the longest line in the
text file. lines do not have one fixed length. I am considering each
character "space" as one column.