If this is just a short throw-away script, there really is no problem with your file handles. However, I do not use them even on small scripts for several reasons.
First, it is good to get in the habit of using variables for file handles; they will stand you in good stead when you start writing larger and more complex programs.
Over time a small script may not stay small. The script may just need a slight modification to do something more, and then just another tiny improvement ...
Finally, I like to reuse code I've already written wherever I can. So small snippets of code tend to get plugged into larger scripts (where it makes sends to do so.)