Discover the output buffering and the autoflush variable.
- [Voiceover] Output buffering is a necessary evil.…In order for a system to be able to handle…large amounts of data, it must buffer that data.…It collects data up and then spits it out all at once…when its buffers are full or according to some algorithm.…Unfortunately, it generally has no easy way…to determine when to flush its buffers.…This is especially bothersome…with the standard output stream.…In this example, I have a silly little script…that asks you for your favorite number…and then it gives you a better number.…The better number is somewhat random,…so it may be different when you run it.…
Let's go ahead and run it.…Now there is a prompt here.…You see it says, "What is your favorite number? "…And you notice my prompt is not showing up…in my output.…But if I come in here and I type a number, say 42,…it now gives me the prompt after…and then it gives me the answer also.…Like I said, it's silly.…So you may also notice that this doesn't behave…the same way on different systems…or even on the same system at different times.…
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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