Cheater!

This person was trying to find a way to change his save file so his character has a wand of wishing.

If you're going to cheat, just run `nethack -D` and you'll start in wizard mode with a wand of wishing. Then you can wish for some kick-ass kit and kick ass all the way down the mazes of menace. Great for messing around.

I recommend:
blessed scroll of charging (gotta recharge the wand!)
blessed +2 gray dragon scale mail
blessed greased fireproof +2 cloak of displacement
*read scroll of charging* (wand is unlikely to take another charge after this)
blessed greased rustproof +2 helm of telepathy
blessed fireproof +2 pair of speed boots
blessed rustproof +2 gauntlets of power (or dexterity)
Reset the wand of wishing to 'z' and hold 'z' down until you squeeze one last charge out of your wand. (wand will be unusable after this)
blessed +2 amulet of life saving (might get ring of levitation if you want to rush down and take madusa and the castle)

Good generic kit that should work for most classes.
Replace the last item with a good weapon if you need it, but with speed, strength, displacement, AND a freaking low AC, you should be able to coast through the dungeon with your eyes closed.