open(FILE, ">folder/${name}/${date}.txt");

##</code><code>##

open(FILE, ">folder/$name/$date.txt");

##</code><code>##

open(FILE, ">folder/$name/$date.txt") || die("Couldn't open file for writing: $!");

##</code><code>##

open FILE, ">folder/$name/$date.txt" or die "Couldn't open file for reading:$!";

##</code><code>##

my $filename = "folder/$name/$date.txt";
open FILE, ">$filename" or die "Couldn't open $filename for writing: $!";