Ruby's ARGV can be empty on windows depending on a way to run script

Question

My demo.rb:

puts ARGV.size

ARGV.each do |a|
  puts \"Argument: #{a}\"
end

The result depends on how we run a script:

>          


        

Answer 1

Open a command window:

assoc .rb

is it rbFile?

ftype rbFile

Make sure that Ruby.exe is followed by "%1" %*

the %* is sometimes missing.