I am running my perl file on XAMPP. First time I execute it then it works OK, but when I refresh it then it doesn't run. To make it run, I have to restart apachee. Can anybody please let me know the reason and solution?
PERL CODE IS: code
#!"D:\xampp\perl"
print "Content-type:text/html\n\n";
print "<H1>Hello World</H1>\n";
require 'D:\xampp\htdocs\sa\settings.pl';
print "Content-type:text/html\n\n"
Why aren't you using the CGI module with it's header method?
When I remove "require " Then it works fine
Then your error_log file should tell you what is going wrong. You don't check for the files existence before requiring it. You should also be including:
use strict;
use warnings;
use diagnostics;
and test running the file from the command line. You should read up on debugging Perl and CGI programs.
Related
Hello
I have got a LAMPP Webserver. I tried to open a CGI Script called "Hello.cgi".
It contains:
#!/usr/bin/perl
print "Hello World.\n";
The path is: /opt/lampp/htdocs/dashboard/cgi-bin/hello.cgi
When I open: "127.0.0.1/dashboard/cgi-bin/hello.cgi", I get following:
Server error!
The server encountered an internal error and was unable to complete your request.
Error message:
End of script output before headers: hello.cgi
If you think this is a server error, please contact the webmaster.
The CGI Script is written in Perl.
If you need more informations about my problem, say it, please.
~~runasas
Firstly, you should never write a Perl program without including the lines use strict; and use warnings;.
Secondly, if you have problems with a CGI program, you should check the web server error log for more details of the problem.
Thirdly, the output from a CGI program needs to include a content type header. So you'll want to add the following:
print "Content-Type: text/plain\015\012\015\012";
This becomes easier if you use the CGI module:
use CGI;
print header('text/plain');
But really, in 2016, you shouldn't be writing CGI programs - there are plenty of good alternatives available.
I have a perl cgi script that is exactly the following:
#!/usr/bin/perl -w
use CGI;
$query = new CGI;
print $query->redirect("http://www.yahoo.com");
At the command line things look OK:
$perl test.pl
Status: 302 Moved
Location: http://www.yahoo.com
When I load it in the browser, http://localhost/cgi-bin/test.pl, the request gets aborted, and depending on the browser I get various messages:
Connection reset by server.
No data received.
The only research I could find on this issue, stated that a common problem is printing some data or header before the redirect call, but I am clearly not doing that here.
I'm hosting it from a QNX box with the default slinger server.
The code works fine on my machine, check the following
Check the error logs, eg: tail /var/log/http/error_log
Do the chmod/chown permissions match other working CGi scripts, compare using ls -l
Does printing the standard hello world work? Change your print statement to
print $query->header(), 'Hello World';
Add the following for better errors
use warnings;
use diagnostics;
use CGI::Carp 'fatalsToBrowser';
at the command line use slinger will return some basic use options. For logging you need both syslogd and -d enabled in slinger. Ie
slinger -d &
Then look to /var/log/syslog for errors
I am trying to run perl script that doing some things and creating files from web browser page in perl. I am using Windows 7.
This is source:
use CGI;
use warnings;
use strict;
print "Content-type:text/html; charset=utf-8\r\n\r\n";
print "<a href='./#'>START</a>";
system("C:\Perl\bin\perl C:\xampp\htdocs\xampp\bc\create_yaml.pl");
When I load this page it'll open cmd, but file what I want to run won't create any files. How can i find out that the script run or not? And how to run this script?
I try to change permission to file that I want to run but still it doesn't work.
Thanks for answers.
I will try to do simple example. But it doesnt create any file... hmmm whats wrong?
use CGI;
use strict;
use warnings;
print "Content-Type: text/html; charset=utf-8\n\n";
system("C:\\Perl\\bin\\perl C:\\xampp\\htdocs\\xampp\\vyber\\bc\\test\\create.pl");
source of create.pl:
open(INFO,">aaaaaaa.txt");
print INFO "voda";
close INFO;
I think your issue is that Windows uses \ for path names, but when you put it in quotes, you need to escape it, because it's a special character. You escape with \:
system("C:\\Perl\\bin\\perl C:\\xampp\\htdocs\\xampp\\bc\\create_yaml.pl");
Also, if your environmental path variables are set up correctly, you can just do this:
system("perl C:\\xampp\\htdocs\\xampp\\bc\\create_yaml.pl");
Or as amon pointed out, you can use forward slashes instead:
system("C:/Perl/bin/perl C:/xampp/htdocs/xampp/bc/create_yaml.pl");
I have run this Perl code:
#!/usr/bin/perl
print "content-type: text/html \n\n";
print "Hello World.\n";
I have tried it in two ways, first one is Testing your Perl installation, but when I run by this way, it has some troubles, it asks me to choose a program with which I can run it, but no running yet.
Second way is first script with Padre, the Perl IDE, but when I write Perl code and try to save it, it does not show me Perl file's extension, so I can't save it as Perl file, so what could I do?
Your code looks like you want a CGI program. CGI means that you call your program through a web browser and get a website back. While vstm's comment was of course right for non-cgi programs, your example requires a little more stuff in order to work like that.
You will need to install a web server. Take a look at xampp. It is simple to install and maintain and comes with a mysql as well as an apache installation. I recommend the lite version since that does not have all the overhead.
Once you've installed it, you need to make some configuration so it can run your perl scripts. I take it you have already installed Active Perl. You then need to tweak the apache config.
in c:\xampp\apache\conf\httpd.conf you need to find the line that says
<Directory "C:/xampp/htdocs">
and read the comments (marked with #). You have to add ExecCGI inside the <Directory> section. Do that for every directory you want perl scripts to be run. Then look for a line that says
AddHandler cgi-script .cgi .pl .asp
and make sure it is not commented out.
Once you're done, place your program in the c:\xampp\htdocs folder (cgi-bin should also work) and change the shebang-line (the first line with #!) to where you've installed Active Perl, e.g. C:\perl\bin\perl.exe. It tells apache what program it should use to execute the perl script.
Also, add some more lines to your code:
#!C:\perl\bin\perl.exe
use strict;
use warnings;
use CGI;
use CGI::Carp('fatalsToBrowser');
print "Content-type: text/html \n\n";
print "Hello World.\n";
Now you need to run the apache web server. In the xampp installation dir there are several batch files that control apache and mysql. There's also a xampp-control.exe. Run it. In the new window, click on the Start button next to Apache.
In your browser, go to http://localhost/<yourscript.pl>. It should now say "Hello World!".
If it does not, make sure you're not running Skype. It blocks your port 80 which the apache tries to run on. You need to change apache's port to something else. Refer to this video.
A few words on the changes in the code I made and what they do:
use strict; should always be in your code. It forces you to honor certain guidelines and to write better code. This might seem strange in a Hello World program, but please do it anyway.
use warnings; tells you about things that might go wrong. Warnings are not errors but rather perl being helpful about stuff you might not know yourself. Use it.
use CGI makes the program's output go to the web server. You need that when you work with CGI programs.
print "Content-type: text/html \n\n"; is needed so the browser knows what to expect. In this case, an HTML website. It is called the HTTP-Header and contains a mime-type.
use CGI::Carp('fatalsToBrowser'); makes errors go to the browser. Without it, you'd never know about them unless you look in apache's error log.
I really do not get how to run a Perl file. I have uploaded my .pl to the cgi-bin then chmod to 755. Then when i go to run the file i just get a 500 internal server error.
**/cgi-bin/helloworld.pl**
#!/usr/bin/perl
print 'hello world';
Any ideas as to what I am doing wrong?
Read the official Perl CGI FAQ.
That'll answer this, and many other questions you may have.
For example: "My CGI script runs from the command line but not the browser. (500 Server Error)"
Hope this helps!
You probably need something like
print "Content-type: text/html\n\n";
before your print statement. Take a look at http://httpd.apache.org/docs/2.0/howto/cgi.html#troubleshoot
It would help to know what server you are using, and the exact error message that's showing up in the server's logs. I'd guess that, if you are using Apache, you'll see something like "Premature end of script headers".
Look into using CGI::Carp to output fatal errors to the browser. use CGI::Carp qw(fatalsToBrowser);
Also, please definitely do use the CGI module to output any needed information such as headers/html/whatever. Printing it all is the wrong way to do it.
EDIT: You will also definitely be able to check an error log of some sort.
Perhaps you need my Troubleshooting Perl CGI scripts
First, find out the path to perl on that system and make sure the shebang line is correct. Giving more information about the system and the web server would also help others diagnose.
Then, try:
#!/path/to/perl/binary
use strict;
use warnings;
$| = 1;
use CGI qw( :default );
print header('text/plain'), "Hello World\n";
Make sure that you can run the script from a shell prompt, without invoking it through Perl. In other words, you should be able to go to your cgi-bin directory and type:
./helloworld.pl
and get output. If that doesn't work, fix that. In looking at the output, the first line must be:
Content-Type: text/html
(Or text/plain or some other valid MIME type.)
If that's not the case, fix that.
Then you must have an empty line before the body of your page is printed. If there's no empty line, your script won't work as a CGI script. So your total output should look like this:
Content-Type: text/html
hello world
If you can run your script and that's the output, then there's something weird going on. If Apache is not logging the error to an error_log file somewhere, then maybe there's some problem with it.
Did you enable Apache to server .pl files as CGI scripts? Check your Apache config file, or (quick but not guaranteed test) try changing the file extension to .cgi. Also, make sure your shebang line (#!) is at the very top. Finally, check the line endings are Unix if your server is Linux. And yes, test it from the command-line, and use strict; for better feedback on potential errors.