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  1. or download this
    open (FILEHANDLE, ">not.txt") or die (Cannot open not.txt");
print FILEHANDLE "hello!";
close (FILEHANDLE);
  2. or download this
    open (FILEHANDLE, ">not.txt") or die ("Cannot open not.txt");
print FILEHANDLE "hello!";
close (FILEHANDLE);
  3. or download this
    use strict;
use warnings;
...
open (FILEHANDLE, ">not.txt") or die ("Cannot open not.txt");
print FILEHANDLE "hello!";
close (FILEHANDLE);