Using the -p option on the command line
Topicalization and Special Variables example from a Well House Consultants training course
More on Topicalization and Special Variables [link]
Source code: perltodiamond Module: P210
=head1 Using the -p option on the command line
Perl's -p command line option adds an implicit
loop around your program, with each line being
read in turn from the file named on the command
line into $_ (the default input and pattern
matching space) and then, after the code has been
run, printing out $_.
In this example, we're changing all Perls to
Diamonds, then moving all vowels one vowel up the
File started like this:
antonia Perl XML PHP Knitting MySQL
barbara Tcl/Tk Lua Ruby Java
cherry Perl Java Ruby MySQL
delia XML PHP Java Lua
ethel MySQL Perl Tcl/Tk Lua
florence Ruby Lua PHP Java
gloria XML Perl Tcl/Tk MySQL
hazel PHP Python Perl Ruby Lua
iris Perl MySQL Java Tcl/Tk
Results like this:
entunoe Doemund XML PHP Knottong MySQL
berbere Tcl/Tk Lae Raby Jeve
chirry Doemund Jeve Raby MySQL
diloe XML PHP Jeve Lae
ithil MySQL Doemund Tcl/Tk Lae
flurinci Raby Lae PHP Jeve
gluroe XML Doemund Tcl/Tk MySQL
hezil PHP Pythun Doemund Raby Lae
oros Doemund MySQL Jeve Tcl/Tk
Learn about this subject
This module and example are covered on the following public courses:
* Perl Programming
* Perl bootcamp
* Learning to program in Perl
* Perl Programming
Also available on on site courses for larger groups
Books covering this topic
Yes. We have over 700 books in our library. Books covering Perl are listed here and when you've selected a relevant book we'll link you on to Amazon to order.
This example comes from our "Topicalization and Special Variables" training module. You'll find a description of the topic and some other closely related examples on the "Topicalization and Special Variables" module index page.
Full description of the source code
The complete training module that describes this source code is availble for download (for limited use) from our download centre.
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
• The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.
Web site author
This web site is written and maintained by Well House Consultants.
Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.
Conditions of use
Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.
This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details.
Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request.
PH: 01144 1225 708225 • FAX: 01144 1225 899360 • EMAIL: email@example.com • WEB: http://www.wellho.net • SKYPE: wellho
PAGE: http://www.wellho.net/resources/ex.php4 • PAGE BUILT: Thu Sep 18 11:03:17 2014 • BUILD SYSTEM: WomanWithCat