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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]

This example is described in the following article(s):
   • Flurinci knows Raby Lae PHP and Jeve - [link]

Source code: perltodiamond Module: P210
#!/usr/bin/perl -p

=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
alphabet ...

=cut


s/Perl/Diamond/;
tr/aeiou/eioua/;

__END__

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.

Other Examples
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.

Other resources
• 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.

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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.

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