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  1. or download this
    my $file = 'file.dat';
open my $fh, '>', $file
    or die "Can't write '$file': $!";
close $fh or die "Close error: $!";
  2. or download this
    system( "echo -n > file.dat" );
  3. or download this
    truncate 'file.dat', 0
    or die "Can't truncate file.dat: $!";