Learning Perl (6th Edition) by Randal L. Schwartz, Tom Phoenix, brian d foy

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By Randal L. Schwartz, Tom Phoenix, brian d foy

If you're simply getting began with Perl, this can be the e-book you want—whether you're a programmer, method administrator, or net hacker. Nicknamed "the Llama" via generations of clients, this bestseller heavily follows the preferred introductory Perl direction taught by way of the authors on the grounds that 1991. This sixth variation covers fresh alterations to the language as much as model 5.14.

Perl is acceptable for nearly any job on virtually any platform, from brief fixes to accomplish internet functions. studying Perl teaches you the fundamentals and exhibits you the way to jot down courses as much as 128 strains long—roughly the dimensions of ninety% of the Perl courses in use at the present time. every one bankruptcy contains workouts that can assist you perform what you've simply realized. different books may perhaps train you to application in Perl, yet this ebook will flip you right into a Perl programmer.

Topics include:

Perl facts and variable types
Subroutines
File operations
Regular expressions
String manipulation (including Unicode)
Lists and sorting
Process management
Smart matching
Use of 3rd occasion modules

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Extra resources for Learning Perl (6th Edition)

Example text

A Whirlwind Tour of Perl | 17 The first line is the #! line, as you saw before. You might need to change that line for your system, as we showed you earlier. The second line runs an external command, named within backquotes (` `). (The backquote key is often found next to the number 1 on full-sized American keyboards. ) The command we used is perldoc -u -f atan2; try typing that in your command line to see what its output looks like. * This command tells you something about the trigonometric function atan2; we’re using it here just as an example of an external command whose output we wish to process.

N"; As you may have guessed by now, this line prints the message Hello, world! At the end of that message is the shortcut \n, which is probably familiar to you if you’ve used another language like C, C++, or Java; it means a newline character. When that’s printed after the message, the print position drops down to the start of the next line, allowing the following shell prompt to appear on a line of its own, rather than being attached to the message. Every line of output should end with a newline character.

Of course, you can access the individual characters when you need to; you’ll see how to do that in later chapters. 35 × 1,025). ‖ Floating-Point Literals A literal is how you represent a value in your Perl source code. A literal is not the result of a calculation or an I/O operation; it’s data that you type directly into your program. Perl’s floating-point literals should look familiar to you. Numbers with and without decimal points are allowed (including an optional plus or minus prefix), as well as tacking on a power-of-10 indicator (exponential notation) with E notation.

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