CS533 Information Retrieval Systems - Technical Presentation

BILKENT UNIVERSITY CS533 Information Retrieval Systems Technical Presentation Web Site

Barýþ UZ

Index of this page

Introduction

Push Technologies

Channels

CGI

ASP

Java

Streaming Media

Overview

Specifications

Getting information from the server

Sending information back to the user

Forms and other usages of CGI programs

Form and other examples and Links

Since a CGI program is executable, there should be some security precautions that needed to be implemented when CGI programs will be used. The CGI program should be placed under a special directory so that the web server knows to execute the program rather than just display it to the browser. This directory is under control of the web master and s/he does not allow an arbitrary user to create CGI program therein. There are some ways to access CGI programs which are specific to your system.

The special directory is generally called /cgi-bin. A CGI program can be written in any language that the underlying operating system allow execution, such as:

C/C++

Fortran

PERL

TCL

Any Unix Shell

Visual Basic

AppleScript

If you are using a programming language like C or Fortran, you know that you must compile the program before it will run. If you are using one of the scripting languages, such as PERL, TCL or a UNIX shell, the script itself only needs to reside in the /cgi-bin directory, since there is no associated source code. Many people prefer to write CGI scripts instead of programs as they are easier to debug, modify and maintain than a typical compiled program.

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