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Perl notes

Abstract

Short notes for an introduction to Perl based on R.L. Schwartz et al. Learning Perl (See references).

Copyright Notice

Copyright © 2011 by Curro Perez-Bernal curropb@uhu.es

This document may used under the terms of the GNU General Public License version 3 or higher.

Contents

• 1 Scalar Data
  • 1.1 Numbers
    • 1.1.1 Numeric Operators
  • 1.2 Strings
    • 1.2.1 String Operators
  • 1.3 Scalar Variables
  • 1.4 Basic Output with print
  • 1.5 Operator Associativity and Precedence
  • 1.6 The if Control Structure
    • 1.6.1 Comparison Operators
    • 1.6.2 Using the if Control Structure
  • 1.7 Getting User Input
  • 1.8 The while Control Structure
  • 1.9 The undef Value
• 2 Lists and Arrays
  • 2.1 Defining and Accessing an Array
    • 2.1.1 List Literals
  • 2.2 List Assignment
  • 2.3 Interpolating Arrays
  • 2.4 Array Operators
    • 2.4.1 Operators pop and push
    • 2.4.2 Operators shift and unshift
    • 2.4.3 The splice Operator
    • 2.4.4 The reverse Operator
    • 2.4.5 The sort Operator
    • 2.4.6 The each Operator
    • 2.4.7 Array clearing
  • 2.5 The foreach control structure
    • 2.5.1 Perl's default scalar variable $_.
  • 2.6 Scalar and List context
    • 2.6.1 List-producing expressions in scalar context.
    • 2.6.2 Scalar-producing expressions in list context.
    • 2.6.3 STDIN in list context.
• 3 References

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Perl notes