Question

CGI/Perl Script Help - Part 3

Asked by: narmi2

Dear Experts,

Continuing on from here:
http://www.experts-exchange.com/Programming/Languages/Scripting/CGI/Q_24871128.html

I now have the code below.  What do I have to do to this inorder to get the "Hello World" message to appear in a web browser?

#!/usr/local/bin/perl -w
use strict;
use CGI 'header'; 
print header('text/plain');
print "Hello World!\n";

                                  
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Asked On
2009-11-04 at 07:36:45ID24871169
Topics

CGI Scripting

,

Perl Programming Language

Participating Experts
2
Points
500
Comments
16

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Answers

 

by: kawasPosted on 2009-11-04 at 07:39:05ID: 25740387

nothing that code should work. place it in the cgi-bin directory, give it execute permissions, and away you go ... any errors should appear in the error log for apache.

 

by: narmi2Posted on 2009-11-04 at 07:49:59ID: 25740517

Will I need to change the file extension from .pl to .cgi?

 

by: kawasPosted on 2009-11-04 at 07:51:06ID: 25740527

you might need to change it, depends on your  setup for the webserver.

 

by: narmi2Posted on 2009-11-04 at 07:52:08ID: 25740548

OK, umm.  Where is the cgi-bin directory?  I am using CentOS 5.4.

 

by: kawasPosted on 2009-11-04 at 07:55:38ID: 25740585

maybe in /var/lib/cgi ... i am actually not sure.

 

by: kawasPosted on 2009-11-04 at 07:56:11ID: 25740592

/usr/lib/cgi

 

by: Adam314Posted on 2009-11-04 at 07:58:10ID: 25740615

Look at your httpd.conf file, and it'll have a DocumentRoot - this is the top-level for your webserver.  Then you'll likely also have a ScriptAlias - this is your cgi-bin directory.  Put your script in that directory.
To know if you need to change the extension, look for the AddHandler directive - whatever extension that specifies is the extension your script will need to have.

 

by: narmi2Posted on 2009-11-04 at 08:02:16ID: 25740662

Thanks, got it.  Trying out the script now.

 

by: narmi2Posted on 2009-11-04 at 08:19:57ID: 25740881

It doesn't seem to work when I point the browser to

http://localhost/cgi-bin/first.cgi

According to the httpd.conf file, the ScriptAlias is pointing to

/var/www/cgi-bin

This directory has the following permissions set

[root@localhost Server]# ls -l /var/www/
drwxr-xr-x  2 root root  4096 Nov  4 16:05 cgi-bin

The file in the /var/www/cgi-bin directory has the following permissions

[root@localhost Server]# ls -l /var/www/cgi-bin
-rwxr-xr-x 1 root root 108 Nov  4 16:05 first.cgi

What am I doing wrong?

The error message I get on the web browser is:

500 Internal Server Error
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Apache/2.2.3 (CentOS) Server at localhost Port 80

 

by: kawasPosted on 2009-11-04 at 08:22:51ID: 25740919

look int he error log.

possible problem: your perl isnt actually in /usr/local/bin/perl ... cgi scripts require the exact path to perl in the #!/usr/local/bin/perl portion of your script.

 

by: narmi2Posted on 2009-11-04 at 08:33:50ID: 25741044

embarrassed to say but, I do not know the path to the error logs.

 

by: kawasPosted on 2009-11-04 at 08:35:39ID: 25741067

that should also be in your httpd.conf file (i think) probably /var/log/apache or /var/log/apache2/

did my suggestion about the first line of your script work?

 

by: narmi2Posted on 2009-11-04 at 08:36:43ID: 25741084

You possible problem error was right.  I changed the script to look for perl in /usr/bin/perl

Still interested to know where the error logs are.

 

by: narmi2Posted on 2009-11-04 at 08:39:02ID: 31650030

Thanks, very helpful.  Follow-up question coming in a few moments.

 

by: narmi2Posted on 2009-11-04 at 08:42:49ID: 25741183

 

by: narmi2Posted on 2009-11-04 at 08:57:00ID: 25741336

20120131-EE-VQP-002

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