How to create a new file in Perl?

Question

I've some values stored in the variables $a,$b,$c. Now I've to load these values into new file (create file & load). I'm new to Perl, how can I do it?

Did you try to find the solution yourself? The Google search "how to write to a file in perl" gives 35.4 mio results — Martin, Jun 14 '12 at 10:41
@Jackie: from your comment you appear to know the answer. What further help do you need? — Borodin, Jun 14 '12 at 10:53
I want to create a new file & then load data into it. does above command create file by name filename.txt if it doesn't exist ? — Jackie James, Jun 14 '12 at 11:02
@Jackie: yes it does. Then you can print to it using `print FILE $variable, 99, "string"` or similar. Experiment and you will see. — Borodin, Jun 14 '12 at 11:31
Regarding your question's title, please write ["perl" or "Perl" but never "PERL"](http://perldoc.perl.org/perlfaq1.html#What's-the-difference-between-%22perl%22-and-%22Perl%22%3f). — pilcrow, Jun 14 '12 at 13:02
`$a` and `$b` aren't good variable names in Perl, since they can conflict or cause confusion with `sort()`s built in `$a` and `$b` variables — plusplus, Jun 14 '12 at 13:29

score 15 · Accepted Answer · edited Feb 06 '16 at 17:47

#!/usr/bin/env perl
use strict;
use warnings FATAL => 'all';
use autodie qw(:all);

my $a = 5;
my $b = 3;
my $c = 10;

#### WRITE ####
{
    open my $fh, '>', 'output.txt';
    print {$fh} $a . "\n";
    print {$fh} $b . "\n";
    print {$fh} $c . "\n";
    close $fh;
}

#### READ ####
{
    open my $fh, '<', 'output.txt';
    my ($a, $b, $c) = <$fh>;
    print $a;
    print $b;
    print $c;
    close $fh;
}

You should read perlopentut and Beginner Perl Maven tutorial: Writing to files.

score 1 · Answer 2 · edited May 19 '23 at 12:29

1

Another option: File::Slurp provides convenient read_file and write_file functions

write_file('/path/file', @data);

edited May 19 '23 at 12:29

MeSo2

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answered Jun 14 '12 at 13:31

plusplus

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score 0 · Answer 3 · answered Jun 14 '12 at 10:55

0

Have a look at the methods LoadFile and DumpFile of the YAML module. They are very easy to use as you just need to throw a filename and the actual data against them.

Ask specific questions if don't get along with these.

answered Jun 14 '12 at 10:55

Daniel Böhmer

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How to create a new file in Perl?

3 Answers3