equick:

You can answer questions like this by referring to the documentation, e.g., perldoc perlop. You may want to review perldoc perldoc to see how to use perldoc, and review perldoc perl to find an overview of the basic documentation. There's also a rumor of a site on the internet called Google that can help you locate answers to simple questions like these.

...roboticus

When your only tool is a hammer, all problems look like your thumb.