I am new to both linux and ruby.  I am using Ubuntu and Ruby 1.9

When I do which ruby, I get /usr/bin/ruby
When I do ruby -v I get ruby 1.9.3p0 (2011-10-30 revision 33570)
[i686-linux]

When I try to kick off a simple script

#!/usr/bin/env

puts "Hello"

I get

./test.rb: line 1: #!/usr/bin/env: No such file or directory
./test.rb: line 4: puts: command not found


Why?

Thanks

Todd