This free book is an excellent tutorial book for beginners. It is a collection of notes and sample codes written by the author while he was learning Perl himself. Topics include binary file, CGI, class, client server, DBM file, debug, directory handle, file handle, file test, function, hard reference, IIS, Internet, language, Linux, module, MySQL, name space, object, object method, online, open directory, open file, package, Perl, regular expression, RPC::XML, sample codes, SOAP, SOAP::Lite, socket communication, soft reference, split, subroutine, performance, TCP, XML, XML-RPC, XML::Simple. Key sections: Perl on Linux - ActivePerl - Data Types - Subroutines - Debug - Modules - References and Nested Data Structures - Objects - Typeglob and Package Exporter - Working with Strings - Input to and Output from Perl Programs - Input and Output in Binary Mode - Reading Directory Entries - Converting Perl Scripts to Executable Programs - Working with File Systems and DBM Files - Accessing MySQL from Perl Programs - String Performance. For more topics in Perl, see my other book "Herong's Tutorial Notes on Perl - Part B".