What are Perl 4, Perl 5, or Perl 6?
(contributed by brian d foy) In short, Perl 4 is the past, Perl 5 is the present, and Perl 6 is the future. The number after perl (i.e. the 5 after Perl 5) is the major release of the perl interpreter as well as the version of the language. Each major version has significant differences that earlier versions cannot support. The current major release of Perl is Perl 5, and was released in 1994. It can run scripts from the previous major release, Perl 4 (March 1991), but has significant differences. It introduced the concept of references, complex data structures, and modules. The Perl 5 interpreter was a complete re-write of the previous perl sources. Perl 6 is the next major version of Perl, but it’s still in development in both its syntax and design. The work started in 2002 and is still ongoing. Many of the most interesting features have shown up in the latest versions of Perl 5, and some Perl 5 modules allow you to use some Perl 6 syntax in your programs. You can learn more about Pe
