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Programming Scripts Articles
Page 29 of 33
Defining Class Methods in Perl
Other object-oriented languages have the concept of security of data to prevent a programmer from changing an object data directly and they provide accessor methods to modify object data. Perl does not have private variables but we can still use the concept of helper methods to manipulate object data.Lets define a helper method to get person’s first name −sub getFirstName { return $self->{_firstName}; }Another helper function to set person’s first name −sub setFirstName { my ( $self, $firstName ) = @_; $self->{_firstName} = $firstName if defined($firstName); return $self->{_firstName}; }Now lets have a look into complete example: ...
Read MoreCreating and Using Objects using Perl
To create an instance of a class (an object) we need an object constructor in Perl. This constructor in Perl is a method defined within the package. Most programmers choose to name this object constructor method new, but in Perl you can use any name.You can use any kind of Perl variable as an object in Perl. Most Perl programmers choose either references to arrays or hashes.Let's create our constructor for our Person class using a Perl hash reference. When creating an object, you need to supply a constructor, which is a subroutine within a package that returns an object ...
Read MoreWhat are Object and Class in Perl?
There are three main terms, explained from the point of view of how Perl handles objects. The terms are object, class, and method.An object within Perl is merely a reference to a data type that knows what class it belongs to. The object is stored as a reference in a scalar variable. Because a scalar only contains a reference to the object, the same scalar can hold different objects in different classes.A class within Perl is a package that contains the corresponding methods required to create and manipulate objects.A method within Perl is a subroutine, defined with the package. The first argument to ...
Read MoreSending an Attachment with email using Perl
If you want to send an attachment in your email using Perl, then following script serves the purpose −#!/usr/bin/perl use MIME::Lite; $to = 'abcd@gmail.com'; $cc = 'efgh@mail.com'; $from = 'webmaster@yourdomain.com'; $subject = 'Test Email'; $message = 'This is test email sent by Perl Script'; $msg = MIME::Lite-=>new( From => $from, To => $to, Cc => $cc, Subject => $subject, Type => 'multipart/mixed' ); # Add your text message. $msg->attach( Type => 'text', Data => $message ); # Specify your file as attachement. $msg->attach(Type => 'image/gif', Path => '/tmp/logo.gif', Filename => 'logo.gif', ...
Read MoreSending an HTML Message using Perl
If you want to send HTML formatted email using sendmail, then you simply need to add Content-type: text/html in the header part of the email as follows −#!/usr/bin/perl $to = 'abcd@gmail.com'; $from = 'webmaster@yourdomain.com'; $subject = 'Test Email'; $message = 'This is test email sent by Perl Script'; open(MAIL, "|/usr/sbin/sendmail -t"); # Email Header print MAIL "To: $to"; print MAIL "From: $from"; print MAIL "Subject: $subject"; print MAIL "Content-type: text/html"; # Email Body print MAIL $message; close(MAIL); print "Email Sent Successfully";
Read MoreSending a Plain Message using Perl
If you are working on Linux/Unix machine then you can simply use sendmail utility inside your Perl program to send email. Here is a sample script that can send an email to a given email ID. Just make sure the given path for sendmail utility is correct. This may be different for your Linux/Unix machine.#!/usr/bin/perl $to = 'abcd@gmail.com'; $from = 'webmaster@yourdomain.com'; $subject = 'Test Email'; $message = 'This is test email sent by Perl Script'; open(MAIL, "|/usr/sbin/sendmail -t"); # Email Header print MAIL "To: $to"; print MAIL "From: $from"; print MAIL "Subject: $subject"; # Email Body print MAIL $message; close(MAIL); ...
Read MoreMatching Boundaries & Selecting Alternatives in Perl
Matching Boundaries in PerlThe \b matches at any word boundary in Perl, as defined by the difference between the \w class and the \W class. Because \w includes the characters for a word, and \W the opposite, this normally means the termination of a word. The \B assertion matches any position that is not a word boundary. For example −/\bcat\b/ # Matches 'the cat sat' but not 'cat on the mat' /\Bcat\B/ # Matches 'verification' but not 'the cat on the mat' /\bcat\B/ # Matches 'catatonic' but not 'polecat' /\Bcat\b/ # Matches 'polecat' but not 'catatonic'Selecting Alternatives in PerlThe | character is just like ...
Read MoreFilehandle Special Variables in Perl
There are various File Handle related Special Variables in Perl. We have listed them in different below in tabular form:$|If set to nonzero, forces an fflush(3) after every write or print on the currently selected output channel.$OUTPUT_AUTOFLUSH$%The current page number of the currently selected output channel.$FORMAT_PAGE_NUMBER$=The current page length (printable lines) of the currently selected output channel. Default is 60.$FORMAT_LINES_PER_PAGE$-The number of lines left on the page of the currently selected output channe$FORMAT_LINES_LEFT$~The name of the current report format for the currently selected output channel. Default is the name of the filehandle.$FORMAT_NAME$^The name of the current top-of-page format for the ...
Read MoreRegular Expression Special Variables in Perl
There are various Regular Expression Special Variables in Perl. We have listed them in different below in tabular form −$digitContains the text matched by the corresponding set of parentheses in the last pattern matched. For example, $1 matches whatever was contained in the first set of parentheses in the previous regular expression.$&The string matched by the last successful pattern match.$MATCH$`The string preceding whatever was matched by the last successful pattern match.$PREMATCH$'The string following whatever was matched by the last successful pattern match.$POSTMATCH$+The last bracket matched by the last search pattern. This is useful if you don't know which of a ...
Read MoreGlobal Special Variable Types in Perl
There are various global special variables in Perl. We have listed them in different blocks based on their usage and nature −Global Array Special Variables@ARGVThe array containing the command-line arguments intended for the script.@INCThe array containing the list of places to look for Perl scripts to be evaluated by the do, require, or use constructs.@FThe array into which the input lines are split when the -a command-line switch is given.Global Hash Special Variables%INCThe hash containing entries for the filename of each file that has been included via do or require.%ENVThe hash containing your current environment.%SIGThe hash used to set signal ...
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