(This was apparently never announced, but has been available for years
Everyone probably knows that you can use "1.", "2.", "all.", etc. to
restrict which objects or characters a certain command should operate on.
put all.sword 3.sack
Howver, it seems like it is not widely known that you can use
"inventory.", "equipment." and "room." to restrict it as well:
put sword room.sack
get all inv.2.sack
The above will put your sword in the first sack in your room, and the
second will get everything from the 2nd sack in your inventory.