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Despite valiant attempts by the marketing departments of Microsoft and Sun, CGI is still the most commonly used architecture for creating dynamic content on the World Wide Web.
CGI is the “Common Gateway Interface” a very grand sounding name for something that is really very simple.
We’ll look at this in more detail soon, but first let’s ensure that we’ve got everything set up so that we can run CGI programs. In the interests of keeping this tutorial down to a manageable size, I’m going to have to assume that you already know something about programming in Perl. This script works on exactly the same principle as the last one, but we get the system time using the Perl function “localtime” and print that value.
This program looks a little more complex, but really it’s doing exactly the same thing as the previous example. The previous section told you just about all that you need to know about displaying output from CGI programs. HTML defines a number of input widgets which you can use to pass user data to a CGI program. This form contains a text input (for the name), a drop-down list (for the age), a pair of radio buttons (for the gender) and a set of checkboxes (for the list of hobbies. Once again we’ve used CGI.pm to produce the HTML, but we’ve also used the same module to get our input. Today we're proud to provide quality products direct to your doorstep through an experience you'll enjoy. It’s nothing more than a protocol that defines how a web server can interact with an executable program to produce dynamic web pages. Just about every Linux distribution comes with a version of Apache which is by far the most common web server on the Internet. You can use just about any language to write CGI programs, but the majority of people seem to use Perl.


There are only a couple of things that distinguish it from a standard Perl program that you’d run from the command line.
The web server will have arranged to capture any data written to STDOUT and to pass it back to the browser. The added complexity comes purely from the fact that we have to display a complete HTML page. In the standard Perl library there is a module called CGI.pm which allows you to “hide” all the HTML generation behind function calls. This is much the same set of widgets that you’ll be familiar with from any GUI application – text fields, radio buttons, checkboxes, pop-down menus and many others.
CGI.pm has a function called “param” which returns information about the data that has been passed to the script. For example the “name” parameter returns the text that was typed into the text box called “name” and the “age” parameter returns whichever of the options in the “age” drop down menu was selected.
Other punctuation marks would be converted to a “%” sign followed by the ASCII code for the character in hexadecimal.
This first tutorial looks at the basics of CGI programming.This article was originally published by Linux Format in April 2001. It defines how the web server sends information to the program and how the program can send information back to the web server which the web server will, in turn, send back to the browser.
In this series of tutorials we’ll assume that you’re using Apache, but the examples should work just as well on any other web server. If not, read the boxout section on debugging CGI programs to get help tracking down the problem.
All CGI programs should output a set of headers which the web server will pass back to the user’s browser. Also note that we have changed the content type to reflect the fact that we are now returning HTML.


This loads the CGI.pm module and asks Perl to import a standard set of functions from that module into our program.
Called without any parameters, “param” will return a list of all of the parameter names and when given the name of a parameter it will return the value associated with that name. See the box “Getting, Installing and Configuring Apache” for more details on how to set Apache up on your system. You wont find a more affordable item that will make your Polaris RZR stand out from the rest. Perl also comes as a standard part of every Linux distribution, so you’ll already have it installed. In this mode Perl will automatically distrust any data that comes from the user and won’t let you pass that data to the operating system until you have untainted it.
Keep your Keys, Wallet, Cell Phones, and other items safe and Dry while riding!See our other listings for more Polaris RZR Parts and Accessories. We’ll see why taint mode is a good idea and how to untaint data in next month’s article, but in the meantime it’s just a good habit to get into. Shipping Information:ALASKA, HAWAII, PUERTO RICO, We will only ship these via USPS, so Please make sure your address is a USPS address. Notice that it takes an optional argument which defines the contents of the <title> tag. This is achieved by printing two newline characters after the final (or, in this case, only) header.



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