Most of the answers to these questions are answered and covered in detail in any number to the O'Reilly books.
And in Perl books by many other publishers, and in the excellent perldoc, and on hundreds of webpages listed in google (and other search engines), and most likely even on this very site.
There's a reason people advise people new to a subject to RTFM. Depending on how you suggest it they may interpret it as rude , but the answers are out there and can be easily found. Answering them again when there's nothing more to add is a huge duplication of effort and accomplishes very little.