Re: Batch processing files in a directory

[7stud]

I've been reading about opendir and readdir as well, so I don't know what my starting point should be.

opendir() will return all the files in a directory--but you only want the .ptseq files, so why start with a bigger set of files than you want? I recommend globbing as your starting point. However, when globbing don't use the line input operator(<>)--use glob() instead.

use strict;
use warnings;
use 5.010;

use File::Basename;


my $target_file_ext = '.ptseq';
my $target_file_pattern = "*$target_file_ext";

for my $in_name (glob $target_file_pattern) {
    my ($name) = fileparse($in_name, ($target_file_ext) );

    my $out_1_name = "${name}1.txt";
    my $out_2_name = "${name}2.txt";

    open my $OUT_1, '>', $out_1_name
        or die "Couldn't open $out_1_name: $!";

    open my $OUT_2, '>', $out_2_name
        or die "Couldn't open $out_2_name: $!";

    open my $INFILE, '<', $in_name
        or die "Couldn't open $in_name: $!";

    while (my $line = <$INFILE>) {
        chomp $line;

        #Some $line processing here:
        say {$OUT_1} "$line  ($out_1_name)";
        say {$OUT_2} "$line  ($out_2_name)";
    }

    close $INFILE;
    close $OUT_1;
    close $OUT_2;
}

Also, note that filenames can look like this: one.two.three.ptseq (which my not apply in your case), so I used File::Basename to extract the filename without the extension.