$ which perl /usr/bin/perl ##

##

 # hello.pl
 #  - Displays a warm greeting

 print "Hello, World!\n";

##

##

 # hello.pl
 #  Displays a warm greeting.

##

##

 $ perl hello.pl
 Hello, World!
 $

##

##

 print "Hello, World!";

##

##

 $ perl hello.pl
 Hello, World!$

##

##

 # hello.pl
 #  Displays a warm greeting.

 my $name = "Brian";
 print "Hello, $name!\n";

##

##

 $ perl hello.pl
 Hello, Brian!
 $

##

##

 my $name = "Brian"; # My scalar variable called 'name' has the value "Brian"

##

##

 print "What is your name? ";
 my $name = ;
 print "Hello, $name!\n";

##

##

 $ perl hello.pl
 What is your name? Brian
 Hello, Brian
 !
 $

##

##

 print "What is your name? ";
 my $name = ;
 chomp($name);
 print "Hello, $name!\n";

##

##

 $ perl hello.pl
 What is your name? Brian
 Hello, Brian!
 $