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  Tutorial: Perl and CGI Introduction to Perl and CGI Perl Syntax Tutorial

This tutorial is an introductory look at the Perl language and its syntax.

Tutorial Details:

Perl Syntax
This tutorial is an introductory look at the Perl language and its syntax.

Semicolons
All Perl lines must end in semicolons. Perl does not use the carriage return to indicate the end of a line, it uses the semicolon.

Comments
It is always a good idea to put ?comments? in your programs. These remind you what you were doing later on. Perl completely ignores your comments. For these, preface the line with the pound sign (?#?). Perl will ignore any line that begins with a pound sign. You do not need to end your comments with semicolons.
Put the following line in front of the line that contains your name:

#tell Perl my name
Put the following line in front of the line that contains ?print?:

#say hello to me!
You can also use comments to tell Perl to ignore parts of your program. You might want to do this to track down a bug, or to bypass a part of the program that isn't working correctly. Scalar Variables
Variables store information. You set a variable with the ?=? modifier:

$myName = "Jerry";
A ?scalar? variable is a variable that only holds one value. Later, we?ll get into ?array? variables, which can hold more than one value, for example, all the first names in Academic Computing. Scalar variables always begin with a dollar sign. Text vs. Numeric
Text variables are surrounded by quotes. Numeric variables can only contain numbers and maybe a decimal point. Perl doesn't care whether a variable is numeric or text until it uses it. If you try to use a variable as numeric when it can?t be converted to a number, Perl assumes it is zero.


 

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