#! perl
use strict;
use warnings;
use Tie::File;
my $filename = 'data.txt';
tie my @lines, 'Tie::File', $filename or die "Cannot tie file '$filename' to array: $!";
for (my $i = 0; $i < @lines; ++$i)
{
my @fields = split ' ', $lines[$i];
$fields[1] .= ' ' x (50 - length $fields[1]);
$lines[$i] = join(' ', @fields);
}
untie @lines;
####
DSE 1232123456 ABCDEF96DS0 20100722 20120827KJHLK LKEDX 058305574 IAC 8 S73 WERTYU
DSE 987 ABCDEF96DS0 20100722 20120827KJHLK LKEDX 058305574 IAC 8 S73 WERTYU
DSE 12321234567890 ABCDEF96DS0 20100722 20120827KJHLK LKEDX 058305574 IAC 8 S73 WERTYU
##
##
DSE 1232123456 ABCDEF96DS0 20100722 20120827KJHLK LKEDX 058305574 IAC 8 S73 WERTYU
DSE 987 ABCDEF96DS0 20100722 20120827KJHLK LKEDX 058305574 IAC 8 S73 WERTYU
DSE 12321234567890 ABCDEF96DS0 20100722 20120827KJHLK LKEDX 058305574 IAC 8 S73 WERTYU