Re^6: Adding a TAB after a certain ammount of characters

[choroba]

Replace the second line

perl -Mstrict -Mwarnings -E

which is for the shell with equivalent Perl lines:

use strict;
use warnings;
use feature 'say';

[biancoari]

This is working GREAT!!!




#!/usr/local/bin/perl 
use strict;
use warnings;
use feature 'say';
my $text =
   q{2013020400000000006810083610022013068100200220130688000200494};
my @offs = ( 17, 6, 31, 3, 3 );
my @cums = ( 0 );
push @cums, $_ + $cums[ -1 ] for @offs;
substr $text, $_, 0, q{-} for reverse @cums[ 1 .. $#cums ];
say $text;




Now what is need to do is to modify all the lines of the file, I know that I need to call the file, like this


 open(FILE, "file1.txt") or die "Could not open file: $!";


Am I heading on the right direction?

[choroba]

Almost. Use lexical file handles and three argument open:

open my $FILE, '<', 'file1.txt' or die "Cannot open file1.txt: $!";

To iterate over the lines of the file, use the diamond operator in a while loop:

while (my $text = <$FILE>) {
    chomp $text;
    my @cums = (0);
    # ...
}

You can define the @offs outside the loop because they never change.

[biancoari]

Thanks everyone, I was able to complete it, here is the the final product

#!/usr/local/bin/perl 
open my $FILE, '<', 'rapipago.txt' or die "Cannot open file1.txt: $!";
use strict;
use warnings;
use feature 'say';
while (my $text = <$FILE>) {
    chomp $text;
    my @cums = (0);
    my @offs = ( 17, 6, 31, 3, 3 );
    my @cums = ( 0 );
    push @cums, $_ + $cums[ -1 ] for @offs;
    substr $text, $_, 0, q{-} for reverse @cums[ 1 .. $#cums ];
say $text;
}

Now I have another question, is there a way that instead of printing with say, the results prints on another file, or the program modifies my first file with the result?