Best practices with STDIN in Ruby? [closed]

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I want to deal with the command line input in Ruby:

> cat input.txt | myprog.rb
> myprog.rb < input.txt
> myprog.rb arg1 arg2 arg3 ...

What is the best way to do it? In particular I want to deal with blank STDIN, and I hope for an elegant solution.

#!/usr/bin/env ruby

STDIN.read.split("\n").each do |a|
   puts a
end

ARGV.each do |b|
    puts b
end

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