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   PERL - First Script

      With PERL installed we are ready to dive into our first script. There
      are a few elements every PERL script must contain in order to function.
      Open up your favorite simple text editor, the file extension for PERL
      scripts is .pl. Save your files with this extension.

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      The first line of every PERL script is a commented line directed toward
      the PERL interpreter. This line is generally the same from one instal
      of PERL to the next, it might look something like this if you were
      running it on linux:

   firstscript-linux.pl:

   #!/usr/bin/perl

      And on a windows operating system it may resemble:

   firstscript-windows.pl:

   #!D:\Perl\bin\perl

      In this tutorial we will assume you are running on a linux server (the
      most common web server), but if you are on windows make sure you use
      the correct path! The comment points to the installation path of Perl,
      usually /usr/bin/perl. You can locate the directory tree to Perl
      somewhere in the documentation of your web server, or email your web
      host and they can specify your Perl installation directory.

   Perl - HTTP Headers

      Because we are working in a web environment we are sort of jumping
      ahead of the game. We have to introduce some HTTP headers so that Perl
      understands we are working with a web browser. To do this we have to
      run another line of strange code called an HTTP header as you may have
      guessed. It looks something like this:

   firstscript.pl:

   #!/usr/bin/perl

   print "content-type: text/html \n\n";

      At this point our script still has no real functionality, all we have
      done thus far is locate our PERL interpreter and tell it that we are
      going to be working with a web browser or in a web environment.

   PERL - Hello, Perl! Script

      Now that we have located the interpreter and told PERL we are working
      with the web, we can print text to the browser with the print function.

   helloperl.pl:

   #!/usr/bin/perl

   print "content-type: text/html \n\n";

   print "Hello, Perl!";

   Display:

      Hello, Perl!

      You should see "Hello, Perl!" in the top left corner of your browser.
      If you have a problem, ask about it on the Perl Forum

   Perl - Execute Your First Script

      Now it is time to upload your firstscript-linux.pl to your web server
      and execute it. After you upload your file be sure to CHMOD the script
      file and allow anonymous execution priviledge, generally a setting of
      0755 works perfectly.

      Your script is working perfectly if you are staring at a blank screen
      and didn't recieve a 500 or 404 error message.

   Perl - Debugging Your Script(s)

      If you are using an FTP program to upload your scripts, set the upload
      type to ASCII or "Text". This setting prevents the mysterious addition
      of random characters that sometimes happens when copying files across
      different operating systems. Learning to do this prevents hours of
      headaches and frustration.

      Another great debugging technique is to isolate the code you are
      currently working on. To do this you can temporarily comment out lines
      of code to isolate only the section that is returning an error message.

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   Found Something Wrong in this Lesson?

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