environment variables - How can I determine the OS of the system from within a Lua script?

Question

Ok I need to determine the system's OS from a Lua script, but Lua as such has no API for this, so I use os.getenv() and query enviromental variables. On Windows checking the enviromental variable "OS" gives me the name of the system's OS, but is there some variable that exists on both Windows and most flavors of Unix that can be checked?

Answer 1

You can try package.config:sub(1,1). It returns the path separator, which is '\' on Windows and '/' on Unixes...