>  system("ls && ls")
> ls: &&: No such file or directory
> ls: ls: No such file or directory
> => false

I see now that it works in Linux, but not windows.  I'm guessing this
is a bug, but feedback is welcome...
-r

 system("ls && ls")
benchmark.rb		    dense_long_to_int.cpp     Makefile			
sparse_long_to_double.cpp
benchmark.rb		    dense_long_to_int.cpp     Makefile			
sparse_long_to_double.cpp
 => true