The Visibooks advisor to PERL fundamentals is helping novices tips on how to create interactive websites utilizing the PERL programming language.It offers a company beginning within the basics of machine programming.
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Extra info for The Visibooks Guide to PERL Basics
Click the link. The output should look like this: 30 LEARNING THE BASICS Insert comments 1. /usr/bin/perl print "Content-Type: text/html \n\n"; # This is a simple script with comments # that explain what the code does. # These comments do not affect the way # the script works. "; # You # can even put comments on the same line # as executable code. LEARNING THE BASICS 31 Tip: If you’re writing a comment in a script and it wraps to the next line, it needs a new # character in front. Incorrect: # The second line lets a browser display the script output.
LEARNING THE BASICS 27 3. html into the home directory of your Web site. html into the /cgi-bin/perlscripts directory. html—resides. 28 LEARNING THE BASICS 4. html LEARNING THE BASICS 29 5. Click the link. The output should look like this: 30 LEARNING THE BASICS Insert comments 1. /usr/bin/perl print "Content-Type: text/html \n\n"; # This is a simple script with comments # that explain what the code does. # These comments do not affect the way # the script works. "; # You # can even put comments on the same line # as executable code.
The first specifies the path to your Web server’s PERL module. The second tells the browser that what comes after this line is HTML. 48 WORKING WITH VARIABLES • $cars_on_lot = 100; $cars_on_lot is the single (scalar) variable. Scalar variables start with a $. The number 100 is assigned to the variable. The number is easy to change—that’s why it’s called a variable.
\n"; These lines should also look familiar. They’re HTML code like we’ve used before, but with a difference: $cars_on_lot. This variable tells the Web browser to get the number specified (100) and insert it here.