September 2012
Beginner
744 pages
15h 48m
English
Content preview from Beginning PerlBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 17
Plays Well with Others
WHAT YOU WILL LEARN IN THIS CHAPTER:
- Reading user input from STDIN and handling command-line arguments
- Reading and writing from/to other programs and understanding STDOUT and STDERR
WROX.COM CODE DOWNLOAD FOR THIS CHAPTER
You can find the wrox.com code downloads for this chapter at http://www.wrox.com/remtitle.cgi?isbn=1118013847 on the Download Code tab. The code for this chapter is divided into the following major examples:
- listing_17_1_directions.pl
- example_17_1_poets.pl
- example_17_2_capture.pl
- listing_17_2_wc.pl
Up to this point, you’ve learned quite a bit about how Perl programs work, but they’ve largely been standalone programs. You haven’t done much work reading information from the command line or reading from or writing to other programs and you haven’t deeply investigated how output is handled. This chapter, although not the last, “wraps up” your beginning Perl knowledge and puts you on the path to becoming a well-rounded Perl developer.
THE COMMAND LINE
If your previous experience with computers has been limited to graphical user interfaces (GUIs), you may have trouble understanding the full power of the command line. Although a pretty graphic interface can make it easy to see how things are organized, it can make some things harder. For example, moving a file to a different directory and renaming it are two steps requiring a few clicks. From the command line, to move foo.txt to backups/mydata.txt, you can do this in with command: ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.