If you are not familiar with subroutines, check out our article on Perl - Getting Started with Subroutines.

Let's say you have the following script. In this example, the greeting subroutine will return string "Hello World".

sub greeting {
  return "Hello World";
}

Outside of the subroutine, the output of the greeting subroutine is stored in the $foo variable.

my $foo = greeting();

You could then print the $foo variable.

print "$foo \n";

Which would return the following.

Hello World

Likewise, you could store the output of the greeting subroutine in an array.