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Introduction to Perl Day 1 An Introduction to Perl Programming Dave Cross Magnum Solutions Ltd [email_address]
What We Will Cover ,[object Object]
Creating and running a Perl program
Getting help
Input and Output
Perl variables
Operators and Functions
What We Will Cover ,[object Object]
Subroutines
Regular Expressions
Smart Matching
Finding and using Modules
Schedule ,[object Object]
11:00 – Coffee break (30 mins)
13:00 – Lunch (90 mins)
14:30 – Begin
16:00 – Coffee break (30 mins)
18:00 – End
Resources ,[object Object]
What is Perl?
Perl's  Name ,[object Object]
Pathologically Eclectic Rubbish Lister
“Perl” is the language
“perl” is the compiler
Never “PERL”
Typical Uses of Perl ,[object Object]
System administration tasks
CGI and web programming
Database interaction
Other Internet programming
Less Typical Uses of Perl ,[object Object]
NASA
What is Perl Like? ,[object Object]
Free (open source)‏
Fast
Flexible
Secure
Fun
The Perl Philosophy ,[object Object]
Three virtues of a programmer ,[object Object]
Impatience
Hubris ,[object Object]
Creating and Running a Perl Program
Creating a Perl Program ,[object Object]
print "Hello world";
Put this in a file called hello.pl
Running a Perl Program ,[object Object]
$ perl hello.pl
Running a Perl Program ,[object Object]
#!/usr/bin/perl
Make program executable
$ chmod +x hello.pl
Run from command line
$ ./hello.pl
Perl Comments ,[object Object]
Start with a hash (#)‏
Continue to end of line
# This is a hello world program print "Hello, world!"; # print
Command Line Options ,[object Object]
For example, -w turns on warnings
Use on command line
perl -w hello.pl
Or on shebang line
#!/usr/bin/perl -w
More usually  use warnings
Getting Help
Perl Documentation ,[object Object]
Accessed through the  perldoc  command
perldoc perl
perldoc perltoc  – table of contents
Also online at http://perldoc.perl.org/
Lots of references through the course
Some Useful Pages ,[object Object]
perldata
perlsyn
perlfaq
perlstyle
perlcheat
Many many more
Perl Variables
What is a Variable? ,[object Object]
A variable needs a name ,[object Object]
To retrieve the data stored in it
Variable Names ,[object Object]
User variable names may not start with numbers
Variable names are preceded by a punctuation mark indicating the type of data
Types of Perl Variable ,[object Object]
Array variables start with @
Hash variables start with % ,[object Object]
Declaring Variables ,[object Object]
But it's a very good idea ,[object Object]
scoping ,[object Object]
use strict; my $var;
Scalar Variables ,[object Object]
my $name = "Arthur";
my $whoami =   'Just Another Perl Hacker';
my $meaning_of_life = 42;
my $number_less_than_1 = 0.000001;
my $very_large_number = 3.27e17;  # 3.27 times 10 to the power of 17
Type Conversions ,[object Object]
Add int to a floating point number
my $sum = $meaning_of_life +   $number_less_than_1;
Putting a number into a string
print "$name says, 'The meaning of life is $sum.'";
Quoting Strings ,[object Object]
my $price = '$9.95';
Double quotes do
my $invline =   "24 widgets @ $price each";
Use a backslash to escape special characters in double quoted strings
print "He said amp;quot;The price is  300amp;quot;";
Better Quotes ,[object Object]
print "He said amp;quot;The price is  300amp;quot;";
This is a tidier alternative
print qq(He said "The price is 300");
Also works for single quotes
print q(He said "That's too expensive");
Undefined Values ,[object Object]
Test for it with  defined()  function
if (defined($my_var)) { ... }
Array Variables ,[object Object]
my @fruit = ('apples', 'oranges',   'guavas', 'passionfruit',   'grapes');
my @magic_numbers = (23, 42, 69);
my @random_scalars = ('mumble', 123.45,   'dave cross',   -300, $name);
Array Elements ,[object Object]
print $fruits[0]; # prints "apples"
Note: Indexes start from zero
print $random_scalars[2]; # prints "dave cross"
Note use of $ as individual element of an array is a scalar
Array Slices ,[object Object]
print @fruits[0,2,4]; # prints "apples", "guavas", # "grapes"
print @fruits[1 .. 3]; # prints "oranges", "guavas", # "passionfruit"
Note use of @ as we are accessing more than one element of the array
Setting Array Values ,[object Object]
$array[400] = 'something else';
Also with slices
@array[4, 7 .. 9] = ('four', 'seven',   'eight',   'nine');
@array[1, 2] = @array[2, 1];
Doesn't need to be an array ,[object Object]
Array Size ,[object Object]
Therefore  $#array + 1  is the number of elements
$count = @array;

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