Learn Perl's basic file handling.
- [Voiceover] A file handle is a special variable…that's used to access a file or other stream.…Here's a working copy of filehandle.pl from…Chapter 12 of the Exercise Files, and you'll notice…here on line seven, I declare a scalar variable…with the text lines.txt in it, and that…is a file, and we can open the file here, and I'll just…double click on it, and you can see that…it's a file with 10 lines of text in it that are numbered.…So, I'll go ahead and close that.…
Down here, around line nine, I open the file…using the Open function, and the Open function…takes several arguments.…The first one is called a file handle, and we'll talk…about that a little more as we go on.…The second one is the file mode…for opening it, and the left-angle bracket…it means to opening it for read.…I would a right-angle bracket if I wanted…to write, and we'll cover more of those…in a minute, and then the file name.…I use or, and the function die,…which we'll talk about later, which displays…an error message and exits.…
Then I simply use the file handle…
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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