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 en

Answer 1

On a Unix system, try os.capture 'uname' where os.capture is defined below:

function os.capture(cmd, raw)
  local f = assert(io.popen(cmd, 'r'))
  local s = assert(f:read('*a'))
  f:close()
  if raw then return s end
  s = string.gsub(s, '^%s+', '')
  s = string.gsub(s, '%s+$', '')
  s = string.gsub(s, '[\n\r]+', ' ')
  return s
end

This will help on all flavors of unix and on Mac OSX. If it fails, you might be on a Windows system? Or check os.getenv 'HOME'.