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Introduction to PERL Programming

Perl is a general-purpose, high-level, interpreted and dynamic programming language. It was initially developed by Larry Wall in 1987 as a general-purpose UNIX scripting language to create report handing out easier. After that it has undergone many modifications and alterations and now it became broadly accepted amongst programmers. The language offers prevailing text processing services without the arbitrary data length limits of many existing UNIX tools, making easy handling of text files. Perl gained extensive recognition in the late 1990s as a CGI scripting language, in part due to its parsing capabilities. Besides this, Perl is also used for system administration, graphics programming, network programming, bioinformatics, finance, and other applications. Perl is called as "the Swiss Army chainsaw of programming languages" due to its power and flexibility. It is also referred to as the duct tape that holds the Internet jointly, in reference to its perceived inelegance and ubiquity. The in general structure of Perl derives mostly from C. It is procedural in nature, with variables, assignment statements, expressions, subroutines, brace-delimited blocks and control structures, Perl has also some features from shell programming. Variables are marked with leading sigils, which decidedly recognize the data type, for example, scalar, array, hash etc, of the variable in context. Significantly, sigils allow variables to be interpolated straightforwardly into strings. Perl has many integral functions that offer tools frequently used in shell programming although many of these tools are implemented by programs external to the shell such as calling and sorting on system services.

There are mainly three broad trends in the computer industry namely rising labor costs, falling hardware costs, and improvements in compiler technology. The design of Perl can be understood as a response to these above mentioned trends. Many former computer languages, such as Fortran and C, meant to make resourceful use of costly computer hardware. Dissimilarity, Perl is intended to make efficient use of expensive computer-programmer. Perl has loads of and wide-ranging applications, compounded by the accessibility of many standard and third-party modules. Perl is executed as a core interpreter, written in C language, together with a big compilation of modules. It is a language optimized for scanning arbitrary text files, taking out information from those text files, and printing reports supported on that information. Perl is also a good quality language for many system administration tasks. This language is intended to be practical that is easy to use, then efficient, and complete, rather than fine-looking e.g. tiny, graceful, minimal. Expression syntax of this language is very much close to C expression syntax. In contrast to most UNIX services, Perl does not randomly limit the size of your data. Although optimized for scanning text, it can also deal with binary data, and can make dbm files appear like hashes.