Hi, below I am using newlines to seperate variables. This is far from foolproof, but demonstrates what you asked for.

open FILE, ">filename" or die $!;
print FILE $myVar, "\n";
close FILE;

#... later on...
open FILE, "filename" or die $!;
$myVal = <FILE>;
chomp $myVal; #remove the newline
close FILE;
[download]

If you need to do more, look at Data::Dumper or Storable, both part of the core modules. They facilitate the serialization of complex data structures.