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

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

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

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

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