added labels to ps()

modules/lib/shutil.lua

@@ -11,6 +11,7 @@ function cat(p)
 end
 function ps(f)
  local f=f or ""
+ print("PID\tName")
  for k,v in ipairs(os.tasks()) do
   if v:find(f) then
    print(tostring(k).."\t"..tostring(v))