This article describes how to write and execute a "Hello World" perl script on Linux (Fedora).

1. the prerequisites

• a text editor of your choice (e.g. vi)
• the perl interpreter

make sure you have installed perl:

#  rpm -qa|grep perl
(...) 
perl-5.8.8-41.fc8.i386

(...)

If it is not installed yet, you can install it with yum (you need to be root to do that):

# yum install perl

2. write the code

open an empty file with a text editor (e.g. vi):

# vi helloworld.pl

#!/usr/bin/perl
print "Hello World!\n";

explanation

#!/usr/bin/perl

This tells the system to use the /usr/bin/perl interpreter to execute the script. You can find out the full path of your perl interpreter by entering the following command:

# which perl
/usr/bin/perl

print "Hello World!\n";

This prints out the string "Hello World!"  followed by a newline (a carriage return).

3. make the script executable

# chmod u+x helloworld.pl

4. run the program

you can now execute the script program with:

# ./helloworld.pl
Hello World!

- or -

# perl helloworld.pl
Hello World!

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