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Scalars

Scalars are accessed by prefixing an identifier with '$'.
scalar:
A single value, either numeric or a character string.
identifier:
A "variable name." It is composed of upper or lower case letters, numbers, and the underscore '_'. Identifiers are case sensitive (like all of perl).
Scalars are assigned to using '=' 
 
	$scalar = expression;

Example

 
        ... 
        ################################################################ 
        # Configuration parameters 
        ################################################################ 
        # this program's name 
        $progname = "mailform";
This is read as "the scalar progname is assigned the string mailform".
  1. The '$' determines that progname is a scalar.
  2. the '=' determines that this an assignment.
  3. The double quotes (") define the string.
  4. All statements end with a semi-colon ';'.
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NCSA
The National Center for Supercomputing Applications
University of Illinois at Urbana-Champaign

[email protected]

Last modified: June 19, 1997