I just want to mention, since it sounds like you are a beginner in Perl, that the method given by ysth will overwrite the contents of your file. If you want to append to a file, you need to open the file as

open my $handle, ">> filename" or die "Couldn't open file: $!";

Note the ">>" instead of ">".

You can print anything else to the file using

print $handle "Hello, world\n";
print $handle $some_other_var;
[download]

until the close command is executed on $handle.