Discover a few other useful special variables.
- [Voiceover] Perl uses special variables…for a number of purposes,…including default values, parameter passing,…process control and configuration options.…Here's a working copy of hello.pl…from Chapter 7 of the exercise files…and here I'm going to show you a few…of the more commonly used special variables.…Let's get started.…I'm going to start out with the environment variable.…This one actually looks like this.…It's a special variable that's a hash…that'll display the environment variables…used for access from the system environment…and it looks like this.…
That percent ENV, that's the special variable…and this'll show us the system environment variables.…We're getting the keys here in for loop…and this is actually a for each…so I'm going to say for each,…and we're getting the keys sorted in…alphabetical order and then we're taking…each key and we're using that to index…into this ENV hash.…When I run this, you'll see there's a lot of them here…and your results will be very different from mine.…
The results will be very different from computer to computer…
Watch to learn the details of the Perl syntax, from variables, conditionals, loops, and data structures to regular expressions, functions, and references. A quick-start guide is included for experienced developers who want to get up and running with Perl 5 fast, and the entire course is recommended for both new and experienced programmers alike. Later chapters cover file handling and reusing code with Perl modules, plus Perl best coding practices.
- Understanding Perl's general syntax and the anatomy of a Perl script
- Writing statements and expressions
- Creating assignments
- Working with variables and strings
- Using data types effectively
- Defining logical flow with conditionals and loops
- Using special variables
- Using Perl operators
- Performing simple Perl programming tasks with expressions
- Matching data
- Defining and calling functions
- Using references
- Handling files in the file I/O
- Using built-in functions
- Reusing code with modules
- Coding with Perl best practices
Skill Level Intermediate
1. Setting Up
About Perl3m 36s
2. Quick Start
3. Basic Syntax
4. Values and Variables
7. Special Variables
9. Regular Expressions
11. References and Structures
12. File I/O
13. Built-In Functions
15. Best Practices
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