Perl and CGI for the World Wide Web

Name: Perl and CGI for the World Wide Web
Price: 3.19 USD
Availability: InStock
ISBN: 9780201353587

ISBN-10: 020135358X

ISBN-13: 9780201353587

Edition: 1999

Authors: Elizabeth Castro

List price: $18.99

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For any course in Digital Graphics, Web Design, Web Scripting and Development, Multimedia, Page Layout, Office Tools, and Operating Systems. These task-based, visual reference guides feature step-by-step instructions and plenty of screen shots to guide students and teachers through the most important tasks. Visual QuickStart Guides are the ideal way to get students up and running quickly, and are used for intermediate and advanced students as a quick reference.

Book details

List price: $18.99
Copyright year: 1999
Publisher: Peachpit Press
Publication date: 11/13/1998
Binding: Paperback
Pages: 272
Size: 6.97" wide x 8.98" long x 0.51" tall
Weight: 0.924
Language: English



Introduction


What is a program?


Why Perl?


What about CGI?


Perl and HTML


Getting Perl


Internet service providers


Ask your ISP!


About this book


What this book is not


The Perl and CGI VQS Guide Web Site



Perl Building Blocks


Perl data


Operators and functions


Quotation marks



Creating Perl CGI Scripts


Creating a Perl CGI script


Starting a Perl CGI script


Writing code in Perl


Creating output for a browser


Documenting your script


Uploading your script to the server


Changing permissions


Checking the script's syntax


Running a Perl CGI script



Getting Data from Visitors


Labeling incoming data


Creating a form


Creating text boxes


Creating password boxes


Creating larger text areas


Creating radio buttons


Creating checkboxes


Creating menus


Creating the submit button


Resetting the form


Using an image to submit data


Creating a link to a script


Using a link to input data to a script


Adding default data to a form



Environmental Variables


Using environment variables to parse forms


Your visitor's browser and platform


How did your visitor get to your page?


Viewing all the environment variables



Getting Data into the Script


Inputting data from a form or a link


Inputting data from environment variables


Inputting scalar data yourself


Inputting arrays yourself


Inputting hashes yourself



Working with Scalars


Storing the result of an operation


Multiplying, dividing, adding, subtracting


Using more than one operator at a time


Raising a number to an exponential power


Getting the remainder of a division


Connecting strings together


Repeating a string


Operating and assigning in one step


Incrementing (or decrementing) a variable



Working with Arrays


Getting a particular item from an array


Splitting a scalar into an array


Modifying all the members of an array


Finding the length of an array


Getting multiple items from an array


Adding items to the beginning of an array


Adding items to the end of an array


Combining two arrays


Removing the first item in an array


Removing the last item in an array


Replacing an item in an array


Replacing more than one item in an array


Sorting arrays


Reversing the order of an array's contents



Conditional Statements


Comparing numbers


Comparing strings


Evaluating conditions without comparisons


Testing two or more comparisons at a time


Creating a basic conditional statement


Adding options for false conditions


Adding multiple, independent conditions


Using unless


Repeating a block while a condition is true


Repeating a block while a condition is false


Executing the block at least once


Repeating a block a given number of times


Repeating a block for each item in an array


Nesting conditional statements



Subroutines


Creating a simple subroutine


Using a simple subroutine


Creating a subroutine that takes input


Calling a subroutine that takes input


Using a subroutine's return value


Setting the return value manually


Storing subroutines in a separate file


Calling subroutines from an external file



Working with Hashes


Getting a value by using a key


Getting several values using keys


Getting all of a hash's values


Getting all of a hash's keys


Getting each key and value in a hash


Removing key-value pairs


Checking to see if a key exists



Analyzing Data


Finding something


Finding and replacing


Seeing and using what was found


Splitting a value into pieces


Constructing search patterns


Tips for constructing search patterns


Matching a single character


Matching a string of characters


Matching a character from a group


Matching a character that's not in the group


Using class shorthands


Limiting the location


Choosing how many to match


Curbing a quantifier's greediness


Matching one element or another


More on using what you already matched



Remembering What Your Visitors Tell You


About hidden fields


Adding hidden fields to a form


Storing collected data in a hidden field


About cookies


Looking at your browser's cookies


Sending a cookie


Setting a cookie's expiration date


Limiting a cookie to a domain


Limiting a cookie to a part of your server


Limiting cookies to secure connections


Reading and using a cookie


How (and why) your visitors refuse cookies



Printing and HTML


Formatting output with HTML


Printing several lines at a time


Simplifying paths to images and links


Creating header and footer subroutines


Outputting a hash as a table


Outputting an array as a list


Formatting numbers and strings


Formatting numbers as dollars and cents


Padding numbers



Files and Directories


Opening a file


Verifying file and directory operations


Writing to an external file


Getting exclusive access to a file


Reading data from an external file


Closing a file


Renaming a file


Removing a file


Checking a file's status


Accessing a directory


Reading the contents of a directory


Closing a directory


Changing the working directory


Creating a directory


Changing permissions from within a script


Removing a directory


Getting ready to e-mail output


Sending output via e-mail


Eliminating extra returns



Debugging


Checking the easy stuff


Creating an error subroutine


Narrowing it down by commenting it out


Following a variable's progress



Using Other Folks' Scripts


Using other folks' scripts


Getting other people's scripts


Expanding compressed scripts


Configuring borrowed scripts


Customizing borrowed scripts



Parsing Form Input


Creating a subroutine


Determining which method was used


Getting name-value pairs from GET


Getting name-value pairs from POST


Storing name-value pairs in a hash


Using the parsed data



Permissions


Who's the owner?


Default permissions


Figuring out the new permissions code



Security


Monitoring visitor input


Watching what is sent to the server


Avoiding tainted data



Unix Essentials


Telnetting to your Unix server


Executing commands in Unix


Dealing with paths in Unix


Changing the working directory


Finding out where you are


Listing directory contents


Eliminating files


Creating and eliminating directories


Decompressing tar and zipped files


Getting help with Unix



Perl and CGI Resources


Text editors


Telnet programs


Other folks' scripts


Learning more


Index