[FIXED] How can I determine the OS of the system from within a Lua script?

Issue

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?

Solution

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'.

Answered By - Norman Ramsey

Answer Checked By - David Marino (PHPFixing Volunteer)