Using in-game server commands does work. /give
[playerId]
[itemId]:[mapId]
[amount]
E.g.
/give
player1 358:2 1
clones
map_2 for player1's use.
gaming.stackexchange.com/users/10117/Crasian
Spawn a map item.
Then go into the server's world folder->data, and delete the new maps' files.
(like if you want to clone map_3 as map_0, delete map_3) then, copy and paste
map_0
(or whatever map you're cloning, and rename it to the new map (example, map_3)
Notch may add a cloning feature in the future, though!
gaming.stackexchange.com/users/10278/Aaron
On a vanilla server, you can do /give (player) 358 1 (map-id)
gaming.stackexchange.com/users/22066/Greg
If you use MCEdit , you can put the map into a chest and copy the chest.
This seems a bit easier than the renaming thing.
gaming.stackexchange.com/users/10500/Trey
earlier the suggestion of placing "/give player1 358:2 1" in the cheats bar was given.
I tried it but for me it didn't work.
But I used that as the basis for another code which will work if the above doesn't: /give [player1]
358 1 1
the "358" is the ID of the map.the first "1" is how many copies you want.the second "1" is which map value.
Automatically, it's 0.
So if you had only "358 1" you'd get a copy of map_0.
But the 1 specifies which map_# you want.
Hope this helps
gaming.stackexchange.com/users/27284/Challenger2008
So far I was able to create clones of map_0, just by pressing shift while taking the map from the crafting table.  But is there any (ingame) way to create a clone of, say, map_1? If not is there a cheat or a server command to clone maps other than map_0?
How can I clone maps in SMP?
gaming.stackexchange.com
<minecraft-java-edition>
gaming.stackexchange.com/questions/23866
gaming.stackexchange.com/users/1667/Emiliano
Using in-game server commands does work. Try using MCEdit, putting the map in a chest and then copying the chest.  Cloning maps in SMP is a simple task of following straightforward instructions, using a Vanilla server.
Cloning maps in SMP seems to be a simple task following straightforward instructions by users.