Table of Contents
Over the past few days, some of our readers have received an error message about testing and debugging a Perl CGI script. This problem occurs for several reasons. We will discuss this below.
PC running slow?
You can check the format of your scripts with the -c switch.Check the error logs through the web server.Use the command line to speed up the script. By passing the variables to the mobile phone, you can check their values.Integrate an interactive debugger.
15.3. Tools
We searched for which may lead to general confusion, but noteverything is a common problem. If you have problems and don’tI would say solutions help before you need them.investigative work. In this chapter, we will look at some of the toolsto help you understand the cause of the problemAn overview of the steps you can take:
-
Check the server error log type on the Internet. Your
-
script will be inbe executed in the descriptor line.
-
Check the value of the variables by typing them in the delete line of the browser.
-
How do I run a CGI script?
Using the debugger interactively.
Let’s take a closer look at each review.
15.3.1. Check Syntax
We announce this in one of the above sections, unfortunatelyneeds to be repeated in your department: if your code is not parsedor assemble, it will never work properly. So get used to itTest both scripts and the -c flagThe path of commands before they are tested in the phone and duringIf added, check Alerts with-w banner. Keep this in mind when using the Taint app (andYou use taint mode with all your scripts, right?), soYou must stick with the -T flag to avoid the biggest consequencesError:
$ perl -wc myScript.cgiToo late for the "-T" option.
So use -wcT:
perl -wcT calendar.cgi
How do you debug a CGI script?
Check the syntax of an individual script with the -c flag.Check the website server error logs.Run your script from our own command line.Check the value of the variables to display them in the browser.Use a fun debugger.
This will also return:
Syntax OK
or list one of the threedetails. Of course, you only have to practice it.-c command line flag anddo not output it to cable through your scripts.
15.3.2. Check Error Logs
How do I troubleshoot a Perl script?
Errors are usually reported in STDERR. some web servers are all unfortunatelywhich are sent to STDERR during the execution of a CGI animation script, end up in yourServer error logs. Thus, you can often find any kindUseful tips for scanning these activity records when problems occur. PossibleLocation of this file relative to Apache:/usr/local/apache/logs/error_log or/usr/var/logs/httpd/error_log. mistakesattached; You probably want to look at the magazine as a family testYour CGI script. If you are using , see the tail command withoption -f:
$ tail -v /usr/local/apache/logs/error_log
New lines will be printed as they would normally be written to a file.
15.3.3. Scripts Run From The Command Line
After all your scripts are passed withsyntaxMake sure the next step is to try and change them from the command line.Keep in mind that due to CGI scripting, most of your data transfer usage is wasted. EnvironmentYou can manually set self-related variables before running your own.Script:
$upload HTTP_COOKIE="user_id=abc123"$export QUERY_STRING="Month=January&Year=2001"$ export REQUEST_METHOD = "GET"$ ./calendar.cgi
You can view the entire output of your canceled ballot, including any headlines you have.Hurry. This can be very helpful if you think your problems are related to this.to the headings you are moving.
If you are using version 2.56 and earlier Name=”INDEX-3048″>
(Offline: enter name=value pairs as you type)
You can then enter the parameters name=”INDEX-3049″> as name-value pairs.dividedequal sign. CGI.pm also ignores spaces, allowinguse quotes:
(offline technique: type name=value pairs on standard input)The month is JanuaryYear = 2001
When done, click Name=”INDEX-3052″>
Like 2.57, CGI.pm nomore calls are automatically increased. .Instead, .you .can .passparameters .for example .factors .in .your .script .(this .works .for .versions, .too):
$ ../calendar.cgi month=january year=2001
If you’d rather have CGI.pm help you by asking the person’s options, you can do so.Always enable this in later versions and use-debug Full argument from CGI.pm:
use CGI qw(-debug);
If you are working with a complex The form needs too much workEnter the parameters manually, then you can intercept the parametersfile that you can use extensively by adding a few lines to it.At the beginning of your fileScript:
#!/usr/bin/perl -wTuse strictly;Use computer graphics;my $q = new CGI;## BEGIN IMPORT CODEOpen FILE, ">/tmp/query1" or die $!;$q->save(*FILE);print $q->header("text/plain" ), "File savedn";## END OF IMPORTED CODE..
How does Perl CGI work?
You should now have saved the file to /tmp/query1which you can use from line command term. Delete pasted codefirst (or return it for future use), you can use a queryDrop it:
PC running slow?
ASR Pro is the ultimate solution for your PC repair needs! Not only does it swiftly and safely diagnose and repair various Windows issues, but it also increases system performance, optimizes memory, improves security and fine tunes your PC for maximum reliability. So why wait? Get started today!
$asif ./catalog.cgi
15.3.4. Dump Variables
When your script runs Name="INDEX-3060"> is correct, but it doesn't make any differencedo what you expect then you have to break it apartdetermine where it fails. The easiest way to do this iscontain several piecesprint Instructions:
under fetch_resultsprint "Input from fetch_results( @_ )n"; #DEBUG# . .
You can aim for these commands or post comments at the endso it's easy to find anddelete when the owners run out.
If you are working with a specific Perl name="INDEX-3065"> data structure, youyou can easily print the software using Data::DamperModule. Just add the following code:
Is Perl CGI still used?
The Dumper function serializes a person’s dataStructure in Perl Source Marketers with correct indentation. If you want to seefrom HTMLPage, be sure to include the product in the
tags or look at the page typeSource.Be sure to include source code when creating complex HTML.to see if your statements have been printed. Often considered a lotIt's easier to open a shared file descriptor in your own log file, let alone print it.Debug your commands here. In fact, you may want to develop your ownown module that provides a way to send debug output towhich may be commonA debug log file and an easy way to turn debug tools on and off.off
Improve the speed of your computer today by downloading this software - it will fix your PC problems.How do I debug a Perl script?
Enter the Perl debugger. # perl -d ./perl_debugger.pl.Display the target lines or subroutine statements and get (l) DB<1> l 10.Set stop pointrenova with get_pattern function with (b)Set some kind of breakpoint on a specific line with (b)Look at each of our breakpoints with (L).
How do I run CGI script locally?
File locations/extensions to search for running CGI scripts The two most common ways are to change the file's domain name to start with ".cgi" and end in ".cgi", or to place the file in a special directory on the server called "/cgi" or "/cgi-bin". . Ask your ISP for the best way to set up a server and visit accordingly.
What are the steps to run the CGI script?
Login to your server directly from SSH as root or sudo user.Open the httpd.conf file for editing: mire /etc/httpd/conf/httpd.conf. Deceive :Find this line: File name: httpd.conf #AddHandler cgi-script .cgi.Restart Apache with the following command: /etc/rc.d/init.d/httpd restart.
Самое простое решение для тестирования и отладки скрипта Perl CGI.
La Soluzione Più Semplice Per La Valutazione E Il Debug Di Uno Script CGI Perl.
Die Einfachste Lösung Zum Testen Und Folglich Zum Debuggen Eines Perl-CGI-Skripts.
De Gemakkelijkste Oplossing Voor Testen In Combinatie Met Het Debuggen Van Een Perl CGI-script.
A Solução Mais Fácil Para Avaliação E Depuração De Um Script Perl CGI.
La Solución Más Básica Para Probar Y Depurar Un Script CGI De Perl.
Najlepsze Rozwiązanie Do Testowania I Debugowania Skryptu Perl CGI.
Perl CGI 스크립트를 테스트하고 디버깅하기 위한 가장 간단한 솔루션입니다.
La Solution Idéale Pour Tester Et Déboguer Un Script Perl CGI.
Den Rekommenderade Lösningen För Att Testa Och Felsöka Ett Perl CGI-skript.
