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Download The Perl Engineering Project


Title: Advanced FAQ script

Title: Advanced FAQ script



An advanced Frequently Asked Question FAQ script is for the you can create your own faq application in u r system

It has the several features inside like Adminstrator can have all permissions to create Questions, delete Questions, modify any question, attach files, create users, can give powers to moderators, super users & etc...wher the user can read all frequently asked questions, if is there any problem faq system so that user canreport problem to the admin & they can post comments for each question
Perl is a dynamic general-purpose programming language and it is for system administration, web development, network programming, GUI development,Perl was originally developed by Larry Wall in 1987 as a general-purpose Unix scripting language..

The language is intended to be easy to use rather than small. Its major features are that it's easy to use, supports both procedural and object-oriented programming, has powerful built-in support for text processing.Perl borrows features from other programming languages including C, shell scripting (sh), AWK, and sed.

Different definitions of Perl are given in perl, perlfaq1 and no doubt other places. From this we can determine that Perl is different things to different people, but that lots of people think it's at least worth writing about.Perl is used for graphics programming, system administration, network programming, finance, bioinformatics, and other applications.

What is PERL?

Why would I use PERL instead of something else?

PERL features

How to run PERL scripts

PERL syntax, variables, quotes

Flow control constructs

Subroutinesv Typical UNIX scripting tasks

File filtering - matching & substitutions

Counting

Naming files

Executing applications & status checking

Mail

More information

Practical Extraction Report Language

Written by Larry Wall who also called it the "Pathologically Eclectic Rubbish Lister“

Combines capabilities of Bourne shell, csh, awk, sed, grep, sort and C

To assist with common tasks that are too heavy or portable-sensitive in shell, and yet too weird or too complicated to code in C or other programming language.

File or list processing - matching, extraction, formatting (text reports, HTML, mail, etc.)

Why would I use PERL instead of something else?

Interpreted language

Commonly used for cgi programs

Very flexible

Very automatic

Can be very simple for a variety of tasks

WIDELY available

HIGHLY portable

PERL features

C-style flow control (similar)

Dynamic allocation

Automatic allocation

Numbers

Lists

Strings

Arrays

Associative arrays (hashes)

Very large set of publicly available libraries for wide range of applications

Math functions (trig, complex)

Automatic conversions as needed

Pattern matching

Standard I/O

Process control

System calls

Can be object oriented

PERL syntax

Free form - whitespace and newlines are ignored, except as delimiters

PERL statements may be continued across line boundaries

All PERL statement end with a ; (semicolon)

Comments begin with the # (pound sign) and end at a newline

no continuation

may be anywhere, not just beginning of line

Comments may be embedded in a statement

see previous item

Basics

• Can make perl files self executable by making first line as #! /bin/perl.

– The extension tells the kernel that the script is a perl script and the first line tells it where to look for perl.

• The -w switch tells perl to produce extra warning messages about potentially dangerous constructs.

• The advantage of Perl is that you dont have to compile create object file and then execute.

• All commands have to end in ";" .

can use unix commands by using.

– System("unix command");

• EG: system("ls *");

– Will give the directory listing on the terminal where it is running.

• The pound sign "#" is the symbol for comment entry. There is no multiline comment entry , so you have to use repeated # for each line.

• The "print command" is used to write outputs on the screen.

– Eg: print "this is ece 902";

Prints "this is ece 902" on the screen.It is very similar to printf statement in C.

• If you want to use formats for printing you can use printf.

How to Store Values

• Scalar variables

• List variables

• Push,pop,shift,unshift,reverse

• Hashes,keys,values,each

• Read from terminal, command line arguments

• Read and write to files

Scalar Variables

• They should always be preceded with the $ symbol.

• There is no necessity to declare the variable before hand .

• There are no datatypes such as character or numeric.

• The scalar variable means that it can store only one value.

• If you treat the variable as character then it can store a character. If you treat it as string it can store one word . if you treat it as a number it can store one number.

• Eg $name = "betty" ;

• The value betty is stored in the scalar variable $name.

• EG: print "$name \n"; The ouput on the screen will be betty.

• Default values for all variables is undef.Which is equivalent to null.

download Advanced FAQ script project
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