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I have a massive project that I'm building just for the heck of it. I need to place hundreds of blocks and I do that easily with the fill command. But, I can't seem to fill an area with top slabs. I tried /fill x1 y1 z1 x2 y2 z2 minecraft:stone_slab then I get bottom slabs placed! Does anyone have a solution to it? If you do then I appreciate it. :)

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In the 1.13 snapshot, use /fill x1 y1 z1 x2 y2 z2 minecraft:oak_slab[type=top].

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The problem here is that the command /fill x1 y1 z1 x2 y2 z2 minecraft:stone_slab automatically means /fill x1 y1 z1 x2 y2 z2 minecraft:stone_slab 0, the 0 is added. If you change this 0 to another value, the slab will change it's position; 8 is for the upper stone slabs:

/fill x1 y1 z1 x2 y2 z2 minecraft:stone_slab 8

Note: This technique works only for Minecraft versions 1.12.2 and older. For newer versions, check out the other answer on this question.

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    @NabeelParkar If this answer solved your problem, hit the check mark. It rewards the answerer, and tells future visitors what solved your problem :)
    – APCoding
    May 19 '16 at 1:05
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Yes, the way that you would do this is by using a square bracket at the end of your block type. If you want top slabs, it would be executed as /fill x1 y1 z1 x2 y2 z2 minecraft:stone_slab[type=top]. If you want to find out some more things about /fill, this video will hopefully help:

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None of the answers posted here work for me (Minecraft Bedrock 1.16+). I was searching forever to get this to work for me. I finally figured it out, and is kind of tricky. The various "original" stone slabs(stonebrick, andesite, cobble, etc.) are broken down into 4 groups(stone_slab, stone_slab2, etc.). There is an additional data value you need to get more specific(top, double)

This will give you mossy stone brick bottom slabs - /fill x1 y1 z1 x2 y2 z2 stone_slab4 Where as this will give you regular stone top slabs - /fill x1 y1 z1 x2 y2 z2 stone_slab4 10

Use the various information in the slab article wiki to help build your command. Took me a lot of tries to ge the regular stone upper slabs. The "Double Upper" used in the artivle is kind of a bad label as it seems to refer to the single upper slabs instead of 2 slabs together.

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    As much as I appreciate you taking your time to figure your problem out yourself, the answers here aren't incorrect. since the question is tagged minecraft-java-edition. If you want, you can "ask" a new question regarding the same issue but for bedrock edition and answer it yourself to help others with your issue.
    – Quijibo
    Nov 30 '20 at 21:15
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As for top slabs, you can pretty much just tab the thing ingame. I did, and it worked out:

/fill {coördinates} {coördinates} minecraft:stone_slab[type=top]

I just tabbed in the command itself, but now you know it.

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