Now it works with relative paths

runonchange.lua

@@ -18,10 +18,13 @@ if #args == 0 then
     return
 end
 
+local curdir = shell.dir()
+
 while true do
     local shall_run = false
     for name, modtime in pairs(modtimes) do
-        local modtime_new = fs.attributes(name).modified
+        local path = name:sub(1,1) == "/" and name or (curdir .. "/" .. name)
+        local modtime_new = fs.attributes(path).modified
         if modtime_new ~= modtime then
             shall_run = true
             modtimes[name] = modtime_new