There is a magic array named ARGV.
It contains the command line arguments to the program.
If the user types:
ruby hello.rb Alice Bob
then ARGV contains:
["Alice", "Bob"]
ARGV is a historical name. It means "Argument Vector" and has been around since the early 1970s.
Change hello.rb to contain:
puts "Hello, " + ARGV[0]
and run it a few times, e.g.
ruby hello.rb Alice
Change hello.rb to say hello to every one of its command line arguments.
For instance:
ruby hello.rb Alice Bob Charlie
Hello, Alice!
Hello, Bob!
Hello, Charlie!
Write a program named add.rb that adds all of its command line arguments together.
e.g.
ruby add.rb 1 2 3
6
Do you remember how to convert a string to an integer?
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