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A module defines its source code to be in a package (much like a Java package), the Perl mechanism for defining namespaces, e.g. CGI or Net::FTP or XML::Parser; the file structure mirrors the namespace structure (e.g. the source code for Net::FTP is in Net/FTP.pm).
The next layer, built from POE::Filter and probably the focus of most Perl Obfuscation Efficianados (see POE #POE Humor below), is the POE::Filter set: "Filters translate between raw streams and cooked chunks of tasty dada." per `sungo' POE::Filter::Block - parses input as fixed-length blocks. On the output side, it merely passes data through ...
Perl is an open-source programming language whose first version, 1.0, was released in 1987. The following table contains the Perl 5 version history, showing its release versions. Not all versions are covered yet.
It provides text processing facilities without the arbitrary data-length limits of many contemporary Unix command line tools. [16] Perl is a highly expressive programming language: source code for a given algorithm can be short and highly compressible. [17] [18]
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The path length of a simple conditional instruction would normally be considered as equal to 2, [citation needed] one instruction to perform the comparison and another to take a branch if the particular condition is satisfied. The length of time to execute each instruction is not normally considered in determining path length and so path length ...
To make this module available to Perl it must be compiled. Build tools like ExtUtils::MakeMaker can do this automatically. (To build manually: the xsubpp tool parses an XS module and outputs C source code; that source code is then compiled to a shared library and placed in a directory where Perl can find it.)
CGI.pm is a large and once widely used Perl module for programming Common Gateway Interface (CGI) web applications, providing a consistent API for receiving and processing user input. There are also functions for producing HTML or XHTML output, but these are now unmaintained and are to be avoided. [ 1 ]