A symbol representing the name of the operating system. Possible values are
:Darwin(OS X), or
An array of the command line arguments passed to Julia, as strings.
The C null pointer constant, sometimes used when calling external code.
The number of CPU cores in the system.
Standard word size on the current machine, in bits.
An object describing which version of Julia is in use.
An array of paths (as strings) where the
requirefunction looks for code.