View difference between Paste ID: Ti7a1wVD and Vi8qspc8

 local tArgs = {...}
 local x, y, z, f
 local xCur, yCur, zCur, fCur
 local xDif, yDif, zDif
 local posIn, posOut, pos
 
 local function syncFile()
   posOut = io.open("data/pos.txt", "w")
   posOut:write(textutils.serialize({xCur, yCur, zCur, fCur}))
   posOut:close()
 end
 
 local function abort(msg)
   syncFile()
   print("ERROR: "..msg)
   do return end
 end
 
 local function up(n)
   for i = 1, n do
     while not turtle.up() do
       turtle.digUp()
     end
     yCur = yCur + 1
     syncFile()
   end
 end
 
 local function down(n)
   for i = 1, n do
     while not turtle.down() do
       turtle.digDown()
     end
     yCur = yCur - 1
     syncFile()
   end
 end
 
 local function moveF(dir, n)
   while fCur ~= dir do
     turtle.turnLeft()
     if dir < 0 or dir > 3 then
       do return end
     end
     if fCur ~= 0 then
       fCur = fCur - 1
     else
       fCur = 3
     end
     syncFile()
   end
   for i = 1, n do
     while not turtle.forward() do
-      up()
+      up(1)
     end
     if fCur == 0 then
       zCur = zCur + 1
     elseif fCur == 1 then
       xCur = xCur - 1
     elseif fCur == 2 then
       zCur = zCur - 1
     elseif fCur == 3 then
       xCur = xCur + 1
     else
       abort("invalid state for fCur")
     end
     syncFile()
   end
 end
 
 if not tArgs[1] or not tArgs[2] or not tArgs[3] then
   print("Usage: goto <x> <y> <z> [<f>]")
   do return end
 end
 
 x = tonumber(tArgs[1])
 y = tonumber(tArgs[2])
 z = tonumber(tArgs[3])
 
 if tArgs[4] then
   f = tonumber(tArgs[4])
 end
 
 posIn = io.open("data/pos.txt", "r")
 pos = posIn:read()
 posIn:close()
 
 pos = textutils.unserialize(pos)
 
 xCur = tonumber(pos[1])
 yCur = tonumber(pos[2])
 zCur = tonumber(pos[3])
 fCur = tonumber(pos[4])
 
 xDif = x - xCur
 zDif = z - zCur
 
 if xDif < 0 then
   xDif = xDif * -1
   moveF(1, xDif)
 else
   moveF(3, xDif)
 end
 
 if zDif < 0 then
   zDif = zDif * -1
   moveF(2, zDif)
 else
   moveF(0, zDif)
 end
 
 yDif = y - yCur
 
 if yDif < 0 then
   yDif = yDif * -1
   down(yDif)
 else
   up(yDif)
 end
 
 if f then
   moveF(f, 0)
 end
 
 syncFile()