Perl Programming

It's hard to make a topic like subroutines interesting.

You have, of course, sigh, the option of sending parameters to a subroutine.

many Unic protrams can act as filters
<> diamond operator. Returns as much input as there is.
If there are no comad line options then it acts like

sub name
{
#body goes here
}

You almost never need to use the & character, only when it's ambiguous. But we're encouraged to use the ampersand and brackets.

@_ is the list that has been passed into me.

Remember the value of pi? It's a good party trick anyway.

returning
Last value evaluated
Can use the return keyword
Return value can be a scalar or list