Perl - Miscellany

Perl module P303

Miscellany

Exercises, examples and other material relating to training module P303. This topic is presented on public course Perl for Larger Projects

Perl for Larger Projects - training course - Objects, huge data, SQL databases, XML, efficiency and other topics.

Perl for Larger Projects - Objects, huge data, SQL databases, XML, efficiency and other topics. This advanced course takes the Perl programmer through ...

http://www.wellho.net/course/plfull.html [course]

Configuring httpd, or Tomcat, to run CGI scripts in Perl

Here's a Perl / CGI script - a "Common Gateway Interface" program that I want to run on my web server, and access via my browser. What server to I need ...

http://www.wellho.net/mouth/2219_Con ... -Perl.html [short article]

Operator overloading - redefining addition and other Perl tricks

What does addition actually mean? It means different things depending on what you're adding together, and in Perl you can redefine additions - and other ...

http://www.wellho.net/mouth/2427_Ope ... ricks.html [short article]

The goto statement ... if you must ...

#!/usr/bin/perl $k = 1; lab1: print $k++,"\n"; ($k

http://www.wellho.net/resources/ex.php4?item=p303/go1 [code sample]

the continue block

#!/usr/bin/perl # Purpose: while / continue open (HOSTS,"/etc/hosts") || die "host file problem\n"; while ($inline = ) { chop $inline; ...

http://www.wellho.net/resources/ex.php4?item=p303/hoco [code sample]

Use of caller and wantarray

#!/usr/bin/perl # variable scope %demo = ("Monday"=>4,"Tuesday"=>5); subz::first_level(); print "Completed\n"; ################################################ ...

http://www.wellho.net/resources/ex.php4?item=p303/owncheck [code sample]

running an operating system command

#!/usr/bin/perl print "please enter command "; chop ($in = ); $r = `$in`; print $r; print "finished\n";

http://www.wellho.net/resources/ex.php4?item=p303/mudemo [code sample]

If you're going to be using Perl in depth every day, this module covers some golden nuggets and extra syntaxes that you might have been looking for. There's a rule of thumb with Perl Ð "If you're finding something more difficult than you expected, there's probably an easier way".

This topic is presented on public course Perl for Larger Projects

Examples from our training material

asp	Command line options to add implicit read loop and split
cmc.pm	Defining a subroutine prototype
dob	uses of "do"
go1	The goto statement ... if you must ...
go2	goto based on a value - a sort of switch
go4	Goto an array of possibilities
hoco	the continue block
mudemo	running an operating system command
mudemo2	Testing to see if a variable is tainted
owncheck	Use of caller and wantarray
spt3	A subroutine prototype defined too late
spt4	A subroutine prototype defined in time
sptest1	Using a prototyped method correctly
sptest2	Using a prototyped method incorrectly
sudemo	Operation that will fail if run tainted

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

Checking calling sequences.
Trust.
Checking yourself.
Subroutine prototypes.
Examples.
Where am I?.
Which file? Which line of that file?.
Goto Statements.
The unconditional goto.
The "computed" goto.
goto a subroutine.
Do and continue.
continue blocks.
do statements.
Command line options.
Tainted Perl.
How does tainting work?.
How do I tell if a scalar is tainted?.
Untainting information.
Other special variables.
Special Lists.
Special Hashes.
Special Scalars.
Special file handles.
Special subroutines.

Complete learning

If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.