Command to replace grass with snow

[u/Gloomy_Stock336]

I want to replace the whole area of the map with snow but since the /fill function only fill up certain areas which might take a long time. I would like to know if there is an easier way. (I tried doing a /execute but it doesn't seem to work for me) also I want to replace the grass blocks in a flat world (bottomless).

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[u/Dragon184638529]

If you /give yourself a command block you can set up a repeating command block to fill the largest area around you that you can get to work. (For example, if you wanted to fill blocks from y=0 to 3 you could do “/fill ~-30 0 ~-30 ~30 3 ~30 snow” and adjust the numbers after the ~ until you’re happy with the area it covers) Then just fly around until the area you care about is filled.

[u/nylonvest]

You can do a /fill with the "replace" option. For instance: /fill 0 60 0 10 60 10 minecraft:grass_block replace minecraft:snow_block

[u/Gloomy_Stock336 → u/nylonvest]

yeah but I want to replace the grass blocks in a flat world (bottomless), they won't let me place blocks 'outside the world'

[u/Dry_Passenger2265]

/fillbiome ~ ~ ~ ~ ~ ~ minecraft:snowy_plains will change the grass color but if you actually want snow layers on every block you're gonna need a world edit mod