[localhost:~/Perl] lynda% more hello.pl
#!/usr/bin/perl -w
# my first perl hello program
# starting Perl (#!, -w), Perl statements, comments (#),
# print, scalar text strings, double quoted strings, 
# ending Perl (exit)

print "Hello world!";
exit;
[localhost:~/Perl] lynda% perl hello.pl
Hello world![localhost:~/Perl] lynda%
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[localhost:~/Perl] lynda% more hello2.pl
#!/usr/bin/perl -w
# hello2.pl, using \n

print "Hello world!\n";
exit;
[localhost:~/Perl] lynda% perl hello2.pl
Hello world!
[localhost:~/Perl] lynda%
=====================================
[localhost:~/Perl] lynda% more hello3.pl
#!/usr/bin/perl -w
# hello3.pl, single quoted strings (' instead of ")

print 'Hello world!\n';
exit;
[localhost:~/Perl] lynda% perl hello3.pl
Hello world!\n[localhost:~/Perl] lynda%
======================================
 [localhost:~/Perl] lynda% more hello4.pl
#!/usr/bin/perl -w
# hello4.pl, receiving input from the keyboard (<STDIN>),
# scalar variable, assignment statement,
# printing a scalar variable
# scalar variable name: "$" followed by a letter or
# underscore, and one or more alphanumeric characters 
# or underscores.

print "What is your name?\n";
$name = <STDIN>;
print "Hello, $name!\n";
exit
[localhost:~/Perl] lynda% perl hello4.pl
What is your name?
Lynda
Hello, Lynda
!
[localhost:~/Perl] lynda%
======================================
[localhost:~/Perl] lynda% more hello5.pl
#!/usr/bin/perl -w
# hello5.pl, receiving input from the keyboard (<STDIN>),
# scalar variable, assignment statement,
# removed \n from question; removed \n from response (chomp)
# printing a scalar variable

print "What is your name? ";
$name = <STDIN>;
chomp ($name);
print "Hello, $name!\n";
exit;
[localhost:~/Perl] lynda% perl hello5.pl
What is your name? Lynda
Hello, Lynda!
[localhost:~/Perl] lynda% perl hello5.pl
What is your name? Lynda Ellis
Hello, Lynda Ellis!
[localhost:~/Perl] lynda%
======================================
[localhost:~/Perl] lynda% more hello6.pl
#!/usr/bin/perl -w
# hello6.pl, receiving input from the user
# chomp and assignment on same line

print "What is your name? ";
chomp ($name = <STDIN>);
print "Hello, $name!\n";
exit;
[localhost:~/Perl] lynda% perl hello6.pl
What is your name? Lynda
Hello, Lynda!
[localhost:~/Perl] lynda%
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