diff --git a/halyde/apps/cd.lua b/halyde/apps/cd.lua
index a4c08b3..aec22b3 100644
--- a/halyde/apps/cd.lua
+++ b/halyde/apps/cd.lua
@@ -3,6 +3,9 @@ local directory = args[1]
 args = nil
 local fs = import("filesystem")
 
+if not directory then
+  return
+end
 if directory == ".." then
   local backDirectory = shell.workingDirectory:match("(.+)/.-/")
   if backDirectory then
diff --git a/halyde/apps/cp.lua b/halyde/apps/cp.lua
index e8b454f..adc6576 100644
--- a/halyde/apps/cp.lua
+++ b/halyde/apps/cp.lua
@@ -3,6 +3,10 @@ local fromFile, toFile = args[1], args[2]
 args = nil
 local fs = import("filesystem")
 
+if not fromFile or not toFile then
+  shell.run("help cp")
+  return
+end
 if fromFile:sub(1, 1) ~= "/" then
   fromFile = shell.workingDirectory .. fromFile
 end
diff --git a/halyde/apps/fetch.lua b/halyde/apps/fetch.lua
index d8bd8fe..54f2716 100644
--- a/halyde/apps/fetch.lua
+++ b/halyde/apps/fetch.lua
@@ -1,4 +1,5 @@
-termlib.cursorPosY = termlib.cursorPosY + 2
+print("")
+print("")
 print(" \27[93m┌┬┐ ┌┐  ┌┐  \n ││├─┤├┬┬┘├─┐\n │┐├┘││││││││\n ││││││││││┌┤\n └┴┴─┴┼┐├─┴─┘\n      └─┘    ")
 termlib.cursorPosX, termlib.cursorPosY = 17, termlib.cursorPosY - 8
 print("\27[92mOS\27[0m: ".._OSVERSION)
diff --git a/halyde/apps/mv.lua b/halyde/apps/mv.lua
index 46c4630..17c7f5a 100644
--- a/halyde/apps/mv.lua
+++ b/halyde/apps/mv.lua
@@ -3,6 +3,10 @@ local fromFile, toFile = args[1], args[2]
 args = nil
 local fs = import("filesystem")
 
+if not fromFile or not toFile then
+  shell.run("help mv")
+  return
+end
 if fromFile:sub(1, 1) ~= "/" then
   fromFile = shell.workingDirectory .. fromFile
 end
diff --git a/halyde/apps/rm.lua b/halyde/apps/rm.lua
index a484664..6c19ae0 100644
--- a/halyde/apps/rm.lua
+++ b/halyde/apps/rm.lua
@@ -3,6 +3,10 @@ local file = args[1]
 args = nil
 local fs = import("filesystem")
 
+if not file then
+  shell.run("help rm")
+  return
+end
 if file:sub(1, 1) ~= "/" then
   file = shell.workingDirectory .. file
 end
diff --git a/halyde/core/boot.lua b/halyde/core/boot.lua
index 50b2364..b0cb264 100644
--- a/halyde/core/boot.lua
+++ b/halyde/core/boot.lua
@@ -1,7 +1,7 @@
 local loadfile = ...
 local filesystem = loadfile("/halyde/lib/filesystem.lua")(loadfile)
 
-_G._OSVERSION = "Halyde 0.8.0"
+_G._OSVERSION = "Halyde 0.8.1"
 
 function _G.import(module, ...)
   local args = table.pack(...)
diff --git a/halyde/core/shell.lua b/halyde/core/shell.lua
index fb4b750..12f0271 100644
--- a/halyde/core/shell.lua
+++ b/halyde/core/shell.lua
@@ -41,6 +41,9 @@ function _G.shell.run(command)
   end
   -- execute the program
   local foundfile = false
+  if not args[1] then
+    return
+  end
   if filesystem.exists(args[1]) then
     foundfile = true
     local path = args[1]
@@ -60,7 +63,15 @@ function _G.shell.run(command)
           if args[1] == file:match("(.+)%.[^%.]+$") then
             foundfile = true
             table.remove(args, 1)
-            import(item..file, table.unpack(args))
+            local function runCommand()
+              import(item..file, table.unpack(args))
+            end
+            local result, reason = xpcall(runCommand, function(errMsg)
+              return errMsg .. "\n\n" .. debug.traceback()
+            end)
+            if not result then
+              print("\27[91m" .. reason)
+            end
             break
           end
         end
diff --git a/halyde/core/termlib.lua b/halyde/core/termlib.lua
index 441f327..1e90427 100644
--- a/halyde/core/termlib.lua
+++ b/halyde/core/termlib.lua
@@ -41,7 +41,13 @@ gpu.setBackground(defaultBackgroundColor)
 
 local function scrollDown()
   if gpu.copy(0,1,width,height,0,-1) then
-    gpu.set(1,height,string.rep(" ",width))
+    local prevForeground = gpu.getForeground()
+    local prevBackground = gpu.getBackground()
+    gpu.setForeground(defaultForegroundColor)
+    gpu.setBackground(defaultBackgroundColor)
+    gpu.fill(1, height, width, 1, " ")
+    gpu.setForeground(prevForeground)
+    gpu.setBackground(prevBackground)
     termlib.cursorPosY=height
   end
 end