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local tArgs = { ... }
local nCount = tArgs[1]
 
if not nCount then
  print("Usage: dig <count>")
  return
end
 
if nCount==0 then
  print("Arg 1, <count> must be greater than zero!")
  return
end
 
while nCount do
  if not turtle.detect() then
    turtle.forward()
    nCount = nCount - 1
  else
    turtle.dig()
  end
end