Howto: Write script in Perl

Q. I’m new to Linux and Perl. I’ve printed perl man page but it is bit confusing and omits a lot of simple things or details. Can you tell me how do I write a perl script? How do I open perl editor?

A. Larry Wall began work on Perl in 1987 and it is a dynamic programming language. Traditionally perl programs are written using text editor such as vi or emacs. The overall structure of Perl derives broadly from C.

Also when you start learning a new programming language, always start with Hello world program.

Hello world Perl Program

Let us print Hello world from a shell prompt. Type the following command (excluding $ ):
$ perl -e 'print "Hello, world!\n"';
Output:

Hello, world!

Let us write hello world program using vi text editor:
$ vi hello.pl
Append code as follows:
#!/usr/bin/perl print "Hello, world!\n";

Save and close the file. Now setup a execute permission:
$ chmod +x hello.pl
Finally execute perl program:
$ ./hello.pl

First, I used the vi command to create a file named hello.pl
The first line of the script used to specify that the script is to be executed by perl program (#!/usr/bin/perl) and not by a shell.
Print command prints hello world on screen. Please note that the notation \n which stands for newline i.e. print a newline.

Howto: Write script in Perl

Hello world Perl Program

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