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Open Source Web Development with LAMP Using Linux, Apache, MySQL, Perl, and PHP [Electronic resources] - نسخه متنی

James Lee, Brent Ware

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• Table of Contents

Open Source Web Development with LAMP: Using Linux, Apache, MySQL, Perl, and PHP

By James Lee, Brent Ware

></a> <p/><p/>Publisher : Addison Wesley <p/><p/>Date Published : December 17, 2002 <p/><p/>ISBN : 0-201-77061-X <p/><p/>Pages : 496 <p/><p/><p/><p/><p/>Open Source technologies are providing contemporary developers with a range of cost-effective and robust alternatives to commercial software for building dynamic, data-driven Web applications. This practical guide presents a comprehensive survey of LAMP (Linux, Apache, MySQL, Perl, and PHP), and it shows how these solutions can be implemented efficiently and securely while improving reliability and dramatically cutting costs.<p/>Open Source Web Development with LAMP focuses on the most important core material necessary so that developers can Topics covered include:

A comprehensive survey of Open Source technologies

Static and dynamic data and embedded HTML on the Web

Linux and Unix distributions, installations, and commands

Apache Web Server, Perl, and MySQL

Web site META language (WML)

Common gateway interface (CGI) and mod_perl

Server Side Includes (SSI), Embperl, and Mason

PHP syntax and functions

In addition to the discussions in the book, a companion Web site-www.opensourcewebbook.com-contains supplemental information, including tools, source code, helpful links to additional resources, and errata as needed.

Complete in coverage and practical in presentation, Open Source Web Development with LAMP spotlights the tools and technologies today''''s developers need to create workable, dynamic, and secure Web sites using Open Source technologies.
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7.4 What Can Go Wrong?


Many of the errors that can occur with CGI programs produce a page displayed in the browser as shown in Figure 7.6. Pretty helpful, huh?


Figure 7.6. Server error


There could be many causes of this condition. The following are some common things to check.


The script is syntactically incorrect (try perl -c script.cgi).


The first line is not #!/usr/bin/perl.


There are incorrect file permissions (try chmod a+rx script.cgi or ls-l).


There are incorrect directory permissions (be sure the cgi-bin directory has 755 permissions).



You can also run the program from the command line:


$ ./error.cgi 
syntax error at ./error.cgi line 6, near ") chomp" 
Execution of ./error.cgi aborted due to compilation errors.

A clue! The script has a syntax error near line 6.

When all else fails, check the error log file /var/log/httpd/error_log. You might see a line that looks like this:


syntax error at /var/www/cgi-bin/error.cgi line 6, near ") chomp" 
Execution of /var/www/cgi-bin/error.cgi aborted due to compilation 
errors. [Fri Mar 25 10:23:17 2002] [error] [client 127.0.0.1] Premature 
end of script headers: /var/www/cgi-bin/error.cgi

Aha! Another clue pointing to line 6!


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