Re: Increaing a field size for a record

[Kenosis]

Here's a substitution option:

use strict;
use warnings;
use File::Slurp qw/read_file write_file/;

write_file 'rij1.txt', map s/^(\S+) (\S+ )/"$1 $2" . ' ' x 39/er,
  read_file 'rij1.txt';

Have assumed the second field isn't empty, as it seems that the OP's suggesting it's currently fixed at 11 non-space characters to which 39 spaces are to be added.