diff --git a/README.md b/README.md
index dc11d83..12d2b88 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,10 @@
 # luash
+**Fork note: Powershell support is still very preliminary. Add-Assembly and calling managed assemblies is not yet supported. To call cmdlets, use verb__noun instead of verb-noun:**
+
+```
+local sh = require("sh")
+write__host("Hello World.")
+```
 
 [![Build Status](https://travis-ci.org/zserge/luash.svg)](https://travis-ci.org/zserge/luash)
 
diff --git a/bsh.lua b/bsh.lua
new file mode 100644
index 0000000..37b6ec6
--- /dev/null
+++ b/bsh.lua
@@ -0,0 +1,88 @@
+--[[
+Bootstrap shell
+
+--]]
+
+
+local function return_shell_output (cmd, pattern, debug)
+  if not cmd then io.stderr:write("cmd to pass to a shell was blank") return nil end
+  if debug then print(string.format("cmd: %s, pattern: %s", cmd, pattern)) end
+
+	local match = false
+	local handle = io.popen(cmd)
+	if not pattern then 
+		match = handle:read("*a")
+	elseif type(pattern) == "string" or type(pattern) == "function"then
+		for v in handle:lines() do 
+			if debug then print(v) end			
+			match = string.match(v, pattern)
+			if match then
+				if debug then print(string.format("Found %s", match)) end
+				break
+			end
+		end
+	else
+		io.stderr:write("Pattern was of wrong type for command " .. cmd)
+	end
+	handle:close()
+	return match
+end
+
+local function return_os()
+	if package.config:sub(1,1) == "\\" then
+		return "WIN"
+	else
+		local ok = return_shell_output("uname -s")
+    if ok then 
+      return ok
+    else
+      return "POSIX"
+    end
+  end
+end
+
+
+local function return_shell(os)
+    if os == "WIN" then
+      return "powershell"
+    else
+      return return_shell_output("echo $SHELL",trim)
+    end
+end
+
+
+local function test_path(os,location)
+  local cmd = ""
+  local pattern = ""
+  local ok = nil
+  assert(location)
+  --NOT string.match %s, this is replaced with the value of 'location'.
+  pattern = string.format("(%s)",location)
+  --check location exists
+  if os == WIN then
+    cmd = string.format("if($(test-path -path %s){echo %s}", location, location)      
+  else
+    cmd = string.format("[ -d \'%s\' ] && echo \'%s\'", location, location)
+  end
+  
+  if return_shell_output(cmd,pattern) then 
+    return true 
+  else
+    return false
+  end
+end
+
+local function return_home_dir(os)
+  local loc_data = "echo $HOME"
+  if os == "WIN" then
+    loc_data = "powershell $env:localappdata"
+  end
+  return return_shell_output(loc_data,trim)
+end
+
+return {
+  get_home_dir = return_home_dir,
+  get_os = return_os,
+  get_shell = return_shell,
+  get_shell_output = return_shell_output  
+  }
\ No newline at end of file
diff --git a/pwr_sh.lua b/pwr_sh.lua
new file mode 100644
index 0000000..e1f3723
--- /dev/null
+++ b/pwr_sh.lua
@@ -0,0 +1,37 @@
+--[[
+Powershell extensions for sh.lua
+--]]
+
+local funciton pwrsh_clean(str,pattern)
+  local pattern = pattern or "__"
+  return str::gsub(pattern,"-")
+end
+
+--[[
+This is what I am attempting to achieve:
+local unzip = '"Add-Type -assembly \'system.io.compression.filesystem\'; [io.compression.zipfile]::ExtractToDirectory(\'<uri>\',\'<destination>\')"'
+--]]
+
+local function net_params_format(one,two,three,four)
+--  local function net_class_call(net_type, method,...)
+  --iterate and format according to resolved type.
+  return string.format("\'%s\','\%s\'",one,two)
+end
+
+local function net_class_call(net_type, method, one, two, three, four)
+--  local function net_class_call(net_type, method,...)
+  local net_type_fmt = string.format("Add-Type -assembly \'%s\';",net_type)
+  local method_fmt = string.format("[%s]::%s(\%s))",net_type,method)
+  local net_call = string.format('"%s %s"',net_type_fmt,method_fmt) 
+--  return string.format('"%s%s %s"',add_type_fmt,net_type_fmt,method_fmt)
+  local net_call_fun = function (one,two,three,four) 
+      return string.format(net_call,net_params_format(one,two)
+    end
+  return net_call_fun
+ end 
+ 
+ local function sanitize_quotes(str)
+   -- sanitize quotes for powershell. Not sure what the means quite yet,
+   -- but I know that powershell uses quote escapes differently.
+   return str
+  end
\ No newline at end of file
diff --git a/pwr_sh_test.lua b/pwr_sh_test.lua
new file mode 100644
index 0000000..b1eac20
--- /dev/null
+++ b/pwr_sh_test.lua
@@ -0,0 +1,27 @@
+local sh = require("sh")
+
+--print(ls("~"))
+local name = "luarocks-2.4.3-win32"
+local ext = ".zip"
+local uri = "http://luarocks.github.io/luarocks/releases/"..name..ext
+local dest_dir = "C:\\temp\\"
+local destination = dest_dir..name..ext
+
+--uri = "-Uri "..uri
+local outfile = "-OutFile"--..destination
+print("-uri",uri,outfile, destination)
+print(Invoke__WebRequest ("-uri",uri,"-outfile", destination))
+--(uri,outfile )
+
+--cd("C:\\temp")
+--print(ls())
+
+--print(type(out))
+--for i,v in pairs(out) do
+--  print("i: "..i,"v: "..v)
+--end
+--print(out)
+--ls = sh.command("ls")
+
+--print(ls("~"))
+
diff --git a/sh.lua b/sh.lua
index e09ebdf..e6024ec 100644
--- a/sh.lua
+++ b/sh.lua
@@ -1,4 +1,23 @@
+--[[
+lua-shell. Converts global scoped function calls into shell commands.
+TODO: create lines co-routine iterator over result
+TODO: create pipe() function to use lua memory as a buffer
+TODO: investigate scope of shell invocation (once, many?).
+follow up is how to preserve environment?
+TODO: can we change global scope to prevent "pollution" of actual global scope?
+--]]
 local M = {}
+local bootsrp = require("bsh")
+
+--init...
+local slash = package.config:sub(1,1)
+local filename = '.shluainput'
+local tmpfile = "/tmp/"..filename
+local trim = "^%s*(.-)%s*$"
+local _os = bootsrp.get_os()
+local shell = bootsrp.get_shell(_os)
+local home_dir = bootsrp.get_home_dir(_os)
+tmpfile = string.format("%s%s%s",home_dir,slash,filename)
 
 -- converts key and it's argument to "-k" or "-k=v" or just ""
 local function arg(k, a)
@@ -46,24 +65,31 @@ local function command(cmd, ...)
 	return function(...)
 		local args = flatten({...})
 		local s = cmd
+    --TODO: Powershell requires quote sanitization. Only outer quotes of the command parameter can be double quotes
 		for _, v in ipairs(prearg) do
 			s = s .. ' ' .. v
 		end
 		for k, v in pairs(args.args) do
 			s = s .. ' ' .. v
 		end
-
+    if args.input == "" then args.input = false end
 		if args.input then
-			local f = io.open(M.tmpfile, 'w')
+			local f = io.open(tmpfile, 'w')
 			f:write(args.input)
 			f:close()
-			s = s .. ' <'..M.tmpfile
+			s = s .. ' <'..tmpfile
 		end
+    myt = {}
+    s= s:gsub("__","-")
+    s = string.format("%s %s",shell, s)
 		local p = io.popen(s, 'r')
 		local output = p:read('*a')
 		local _, exit, status = p:close()
-		os.remove(M.tmpfile)
-
+    
+    if args.input then
+      os.remove(tmpfile)
+    end
+    
 		local t = {
 			__input = output,
 			__exitcode = exit == 'exit' and status or 127,
@@ -94,9 +120,34 @@ mt.__index = function(t, cmd)
 	return command(cmd)
 end
 
+local function set_temp(location)
+  --This should be sanitized
+  if test_path(location) then
+    tmpfile = location
+    return true
+  else
+    return nil, "location not found"
+  end
+end
+
+local function get_temp()
+  return tmpfile
+end
+local function get_shell()
+  return shell
+end
+
+local function set_shell(sh_name)
+  --assert(false,"NOT IMPLEMENTED")
+  if not os == "WIN" then 
+    local ok = return_shell_output("which "..sh_name,trim)
+    if ok then shell = sh_name return true end
+  end
+  return nil, "Not supported"
+end
+
 -- export command() function and configurable temporary "input" file
 M.command = command
-M.tmpfile = '/tmp/shluainput'
 
 -- allow to call sh to run shell commands
 setmetatable(M, {
@@ -105,4 +156,12 @@ setmetatable(M, {
 	end
 })
 
+
+M.get_temp = get_temp
+M.set_temp = set_temp
+M.get_shell = get_shell
+M.set_shell = set_shell
+M.slash = slash
+M.os = _os
+
 return M