perl lauange
- 2. INDEX :- 1. Perl introduction - perl history - what is perl - basic syntax - perl resourses 2. Versions of perl 3. Perl features 4 .Perl advantages 5 .Perl dis – advantages 6 .conclusion
- 3. Introduction
- 4. History of perl :- Who did introduse this perl ? When did introduse it ? Which perpose introdused it ?
- 5. Who - perl language designed and developed by “LARRY WALL “ When - IN 1987 Purpose - reporting tools in unix
- 6. What is perl
- 7. Practical Extraction and Report Language A scripting language which is both relatively simple to learn and yet remarkably powerful.
- 8. Perl is a high level programming language It is suitable for a wide varity of applications It is an open sourse technology A widely using web scripting languge
- 9. Perl is a High-level scripting language - no compiling is needed - it runs on unix , windows ,linux fast and easy test processing capability fast and easy file handling capabilityvides It can be used for large variety of tasks Perl provides a large number of tools for quite in complicated situstions
- 10. Perl implimented as in interpreted language Perl satnds for practical extractions and reporting language Perl language is easily manipulating test , files and preocess It is faster than sh or csh . And slower then c It can compiles at run time
- 11. It is available for unix ,windows ,mac os Perl has become a very large system of modules
- 12. It is a high level programming language And interpreted language It is also scripted language Why is use
- 13. It is easy to gain a basic understanding of the language and start writing useful programs quickly. There are a number of shortcuts which make programming ‘easier’. Perl is popular and widely used, especially for system administration and WWW programming.
- 14. Basic syntax :- Statements end with “;” Comments starts with “#” - only single line comments U don’t have to declare variable before u access it
- 15. Variables of perl It has ‘3 ‘ variables mainly Scaler variables , denoted by ‘$’ symbol List variables , denoted by ‘@ ‘ symbol Hash variables , denoted by ‘ %’ symbol
- 16. Scalar variables They should always be preceded with the $ symbol There are no datatypes such as character or numeric The scalar variables means that it can store only one value If u treat the variables as character then it can store a character . If u treat it as a number It can store one number Eg : $name = “chitty”;
- 17. List variables They are like arrays . It can be considered as a group of scalar variables They always preceded by the @ symbol Eg @names = “veronica”;
- 18. Hash variables It has push , pop , shift , unshift operaters Push and pop treat the list variables as a stack and operate on it they act on the higher subscript . Shift and unshift act on the lower subscript
- 19. Where using in real world In test processing for web programming System administration Web automation
- 20. Avilable resourses :- Books :- learning perl - by larry wall programming perl - by larry wall ,
- 21. Web site :- http:safari.orially.com contains both learning perl and programming perl in ebook form
- 22. Perl and web :- Perl used to be the most popular web programming language due to its test manipulation capabilities and rapid development cycle. Perl can handle encrypted Web data, including e- commerce transactions. Perl can be embedded into web servers to speed up processing by as much as 2000%. Perl's mod_perl allows the Apache web server to embed a Perl interpreter. Perl's DBI package makes web-database integration easy.
- 23. Versions of perl :- Perl 1. 0 version was introdused in 1987 (Larry wall introduced , while he was working as a programmer at unisys). The language expended over the next years. Perl 2 (version) was introdused in 1988 ,this featured better regular expresion. Perl 3 was released in 1989.
- 24. Perl 4.036 was released in 1994. Perl 5.000 relesed 1994 ,october 17, it was nearly completely rewrite of the interpreter, and also added many features to the language including objects , lexical variables ,and modules
- 25. Perl 5.003 was released june 25, 1996 as a security release. Finnally the latest version was released in may 30, 2017 (5.26.0)
- 26. Features of perl :- the best features from other languages, such as C, awk, Perl takes sed, sh, and BASIC, among others. Perls database integration interface DBI supports third-party databases including Oracle, Sybase, Postgres, MySQL and others. Perl works with HTML, XML, and other mark-up languages. Perl supports Unicode. Perl supports both procedural and object-oriented programming. Perl interfaces with external C/C++ libraries through XS or SWIG. Perl is extensible. There are over 20,000 third party modules available from the Comprehensive Perl Archive Network (CPAN). The Perl interpreter can be embedded into other systems.
- 27. Advanteges of perl :- 1) Perl runs on all platforms and is far more portable than C. 2) Perl is a huge collection of Perl Modules are free software (either GNU General Public License or Artistic License). 3) Perl is very much efficient in TEXT and STRING manipulation i.e. REG_EXP. 4) It is a language that combines the best features from many other languages and is very easy to learn if you approach it properly. 5) Dynamic memory allocation is very easy in PERL, at any point of time we can increase or decrease the size of the array.
- 28. Disadvantages of perl 1) You cannot easily create a binary image ("exe") from a Perl file. It's not a serious problem on Unix, but it might be a problem on Windows. 2) Moreover, if you write a script which uses modules from CPAN, and want to run it on another computer, you need to install all the modules on that other computer, which can be a drag. 3) Perl is an interpretative language, so its comparatively slower to other compiling language like C. So, it s not feasible to use in Real time environment like in flight simulation system.
- 29. THANK YOU