LINUX CLASSES - PERL PROGRAMMING

Perl - What Basics Should I Know?

Perl is an interpreted language that is very popular in the Unix community because it has a rich and powerful feature set, but is still easy to use. Perl borrows heavily from other languages such as C and awk and is especially useful for processing text, generating reports, and handling Common Gateway Interface (CGI) requests submitted via Web browsers. Perl has been ported to many non-Unix environments, including DOS, OS/2, Macintosh, VMS, and Windows NT. The fact that a Perl program can run with little or no modification on many different platforms is another reason for its popularity. In this section, I'll introduce you to basics of Perl and point you to some resources where you can learn more.

Perl Basics

To create a Perl script, use a text editor to enter Perl commands, save the file with a .pl extension (such as sample.pl), and then use chmod to mark the file as executable. The extension is not required, but it's a common Unix convention and will help you identify your Perl source files without looking inside.

Here's a very simple Perl script:

#!/usr/bin/perl
print "I am here. \n";

The mysterious first line starting with "pound splat slash" is required for all Perl scripts to run; it tells the system where to find the Perl interpreter. Hopefully, you've already figured out that this program prints a message followed by the newline character.

Unlike the echo command in Bash scripts, Perl's print command doesn't automatically send a carriage return and line feed. If you forget the \n sequence, the next print command will start on the same line. Also note that all Perl statements must end with a semicolon.

Previous Lesson: Shell Script Debugging
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Comments - most recent first
(Please feel free to answer questions posted by others!)

Bob Rankin     (19 Dec 2012, 13:30)
CORRECTION: The URL should be as follows:

http://science.webhostinggeeks.com/perl-koje-osnovne
Bob Rankin     (19 Dec 2012, 12:25)
See this page in Serbo-Croation language:

http://science.webhostinggeeks.com/perl-koje-osnovn
George     (19 Mar 2012, 05:30)
Thanks for this brief, but very helpfull perl basics course. Great job.
Sandeep B     (28 Feb 2012, 10:14)
thank u for giving information about perl i learned some basics about the pearl on ur site
it's good

Majed     (06 Dec 2011, 08:00)
well in gentoo to install perl you type emerge perl, in other systems use yum perl or yast perl.
Oleg     (08 Jul 2011, 20:17)
Sorry for silly question, but how to upgrade/install perl?

vikram     (28 Apr 2011, 12:41)
thank u for giving information about perl i learned some basics about the pearl on ur site
it's good for basic learners
avenger     (18 Apr 2011, 21:20)
I been learning Perl for quite some time.I'm still
looking for a compiler(preferably online).
Psnarf     (03 Apr 2011, 14:17)
Doc, it's about time I found this site! Thanks to your work, the stuff in all those O'Reilly books is finally starting to make sense. Appreciate your expert guidance through the Perly maze.
my $Nooby = $0;
amit@queens     (21 Mar 2011, 13:13)
A really helpful site for someone not looking for tons of programming cant.
I'm an applied mathematics student , and this site helped me regain hang of the linux i had studied years ago, in couple of hours.
Great job.
it would be great if you could provide an introduction to Python as well.
seenu     (20 Jan 2011, 03:44)
hi am eee student in jntu university i need some pdf linux books if u can provide me
somila     (28 Nov 2010, 15:00)
cool site
safi     (08 Nov 2010, 04:12)
hi am cs student in kabul university i need some pdf linux books if u can provide me
C.King     (29 Sep 2010, 13:01)
Very helpful, great for just getting started. Thanks.
shirish     (15 Aug 2010, 15:03)
hi this shirish shukla from india
am just completd RHCE exam with 100%
I need your help for understanding
perl scripting from base
would be great if you coluld sent me any pdf or any files hat started from base of learning..

Thanks
Shirish
G     (04 Aug 2010, 15:10)
exactly what I was looking for, thanks.
Bob Rankin     (06 Apr 2010, 07:36)
You could enter:
perl example.pl
Or make sure it's executable with the command:
chmod a+rx example.pl
Then you can run it just by typing:
example.pl
A.Kamel     (03 Apr 2010, 11:37)
Could you notify How to run script after create it as $./example.pl
prashant     (19 Mar 2010, 04:11)
very good disciption about all the things...nice one...thnku..

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