gistfile1

system ~ $ ls -l blah.rb ; cat blah.rb
-rwxr-xr-x  1 headius  staff  53 Dec 12 03:41 blah.rb
#!/Users/headius/foo

puts 'this should run in Ruby'

system ~ $ ls -l foo ; cat foo
-rwxr-xr-x  1 headius  staff  21 Dec 12 03:41 foo
#!/bin/bash

ruby $@

system ~ $ ./blah.rb 
./blah.rb: line 3: puts: command not found