made the shell not return pcall's true if it is true

exec/shell.lua

@@ -26,11 +26,20 @@ setmetatable(shenv,{__index=function(_,k)
  if _G[k] then
   return _G[k]
  elseif fs.exists("/boot/exec/"..k..".lua") then
+  local rqid = string.format("shell-%d",math.random(1,99999))
   return function(...)
    local tA = {...}
-   local pid = os.spawn(function() loadfile("/boot/exec/"..k..".lua")(table.unpack(tA)) end,"/boot/exec/"..k..".lua")
+   local pid = os.spawn(function() computer.pushSignal(rqid,pcall(loadfile("/boot/exec/"..k..".lua"),table.unpack(tA))) end,"/boot/exec/"..k..".lua")
+   local tE = {}
    repeat
-    coroutine.yield()
+    tE = {coroutine.yield()}
+    if tE[1] == rqid then
+     table.remove(tE,1)
+     if tE[1] == true then
+      table.remove(tE,1)
+     end
+     return table.unpack(tE)
+    end
    until tTasks[pid] == nil
   end
  end