How can I detect the operating system in Perl?

Question

I have Perl on Mac, Windows and Ubuntu. How can I tell from within the script which one is which? Thanks in advance.

Edit: I was asked what I am doi

Answer 1

Here's a quick reference on how to find the OS the local machine is running from Perl.

The $^O variable ($OSTYPE if you use English) contains the operating system that your perl binary was built for.