diff --git a/computers/commands.lua b/computers/commands.lua
index a89be2d..492cc5e 100644
--- a/computers/commands.lua
+++ b/computers/commands.lua
@@ -1,6 +1,12 @@
 computers.registered_commands = {}
 computers.registered_confs = {}
 
+minetest.register_privilege("computers_filesystem", {
+    description = "advanced use of computers filesystem",
+    give_to_singleplayer = false,
+    give_to_admin = false,
+})
+
 function computers.register_command(modpath)
     local func = dofile(modpath .. "/init.lua")
     local f = io.open(modpath .. "/conf.json")
diff --git a/computers/commands/cd/conf.json b/computers/commands/cd/conf.json
index a67e64a..20574fa 100644
--- a/computers/commands/cd/conf.json
+++ b/computers/commands/cd/conf.json
@@ -1,7 +1,7 @@
 {
     "name": "cd",
     "license": "MIT",
-    "version": 0.1,
-    "engine": 0.4,
+    "version": 0.11,
+    "engine": 0.41,
     "help": "move in and out of folders"
 }
\ No newline at end of file
diff --git a/computers/commands/cd/init.lua b/computers/commands/cd/init.lua
index 925350f..45a5483 100644
--- a/computers/commands/cd/init.lua
+++ b/computers/commands/cd/init.lua
@@ -1,4 +1,7 @@
 function cd(pos, input, data)
+    if not minetest.check_player_privs(data.player, "computers_filesystem") then
+        return "ERROR: permision denied"
+    end
     local path = computers.devicepath .. "/" .. minetest.hash_node_position(pos) .. data.element.pwd
 
     if input and input ~= "" and not input:find("/") and not input:find("\\") then
diff --git a/computers/commands/mkdir/conf.json b/computers/commands/mkdir/conf.json
index f862bbc..e624619 100644
--- a/computers/commands/mkdir/conf.json
+++ b/computers/commands/mkdir/conf.json
@@ -1,7 +1,7 @@
 {
     "name": "mkdir",
     "license": "MIT",
-    "version": 0.1,
-    "engine": 0.4,
+    "version": 0.11,
+    "engine": 0.41,
     "help": "makes a dir in the current path"
 }
\ No newline at end of file
diff --git a/computers/commands/mkdir/init.lua b/computers/commands/mkdir/init.lua
index dad19f7..5dbdd54 100644
--- a/computers/commands/mkdir/init.lua
+++ b/computers/commands/mkdir/init.lua
@@ -1,4 +1,7 @@
 function mkdir(pos, input, data)
+    if not minetest.check_player_privs(data.player, "computers_filesystem") then
+        return "ERROR: permision denied"
+    end
     local path = computers.devicepath .. "/" .. minetest.hash_node_position(pos) .. data.element.pwd
 
     if input and input ~= "" and not input:find("/") and not input:find("\\") then
diff --git a/computers/commands/touch/conf.json b/computers/commands/touch/conf.json
index 2501f4c..0d69882 100644
--- a/computers/commands/touch/conf.json
+++ b/computers/commands/touch/conf.json
@@ -1,7 +1,7 @@
 {
     "name": "touch",
     "license": "MIT",
-    "version": 0.1,
+    "version": 0.2,
     "engine": 0.4,
     "help": "creates a file in the current path"
 }
\ No newline at end of file
diff --git a/computers/commands/touch/init.lua b/computers/commands/touch/init.lua
index 9039d79..0e28c43 100644
--- a/computers/commands/touch/init.lua
+++ b/computers/commands/touch/init.lua
@@ -4,6 +4,11 @@ function touch(pos, input, data)
     minetest.mkdir(path)
 
     if input and input ~= "" and not input:find("/") then
+        for _, item in pairs(minetest.get_dir_list(path, nil)) do
+            if item == input then
+                return "ERROR: trying to create already existing file/folder"
+            end
+        end
         minetest.safe_file_write(path .. "/" .. input, "")
         return "file " .. input .. " created"
     else
diff --git a/computers/gui.lua b/computers/gui.lua
index cef87e5..df7bd72 100644
--- a/computers/gui.lua
+++ b/computers/gui.lua
@@ -127,7 +127,8 @@ function computers.load_gui(pos, node, clicker)
                     local eindex = futil.get_index_by_name(form[cindex], "terminal_output")
                     local text = form[cindex][eindex].default
                     local pass_table = {
-                        element = element
+                        element = element,
+                        player = player
                     }
 
                     if value == "clear" then
@@ -136,17 +137,20 @@ function computers.load_gui(pos, node, clicker)
 
                     local cdata = value:split(" ", false, 1)
 
-                    if computers.registered_commands[cdata[1]] then
+                    if value == "clear" then
+                        form[cindex][eindex].default = "user:~$ "
+                    elseif value == "" then
+                        form[cindex][eindex].default = text .. "user:~" .. element.pwd .."$" .. "\n"
+                    elseif computers.registered_commands[cdata[1]] and cdata[2] == "-v" then
+                        form[cindex][eindex].default = text .. value .. "\n" ..
+                            computers.registered_confs[cdata[1]].version .. "\nuser:~" .. element.pwd .."$" .. "\n"
+                    elseif computers.registered_commands[cdata[1]] then
                         form[cindex][eindex].default = text .. value .. "\n"
                         text = form[cindex][eindex].default
                         local output = computers.registered_commands[cdata[1]](pos, cdata[2], pass_table)
                         if output and type(output) == "string" then
                             form[cindex][eindex].default = text .. output .. "\n" .. "user:~" .. element.pwd .."$" .." "
                         end
-                    elseif value == "clear" then
-                        form[cindex][eindex].default = "user:~$ "
-                    elseif value == "" then
-                        form[cindex][eindex].default = text .. "user:~" .. element.pwd .."$" .. "\n"
                     else
                         form[cindex][eindex].default = text .. value ..
                             "\nERROR: command not found\n" .. "user:~" .. element.pwd .."$" .. " "
diff --git a/computers/init.lua b/computers/init.lua
index 55849b4..7e3f3a3 100644
--- a/computers/init.lua
+++ b/computers/init.lua
@@ -8,7 +8,7 @@ minetest.mkdir(computers.devicepath) --make sure it exists
 minetest.mkdir(computers.networkpath) --make sure it exists
 
 computers.os = {
-    version = 0.4,
+    version = 0.41,
     name = "kuto",
     authors = {"wsor", "luk3yx"},
     license = "MIT",