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How do I test for an item with a name in a player's inventory? I want to make a working command that checks that the player has an identity card with a specific name to open doors.

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    This question is similar to: Clear item with custom name?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem.
    – pppery
    Commented Oct 24 at 15:29
  • @pppery Does the /clear command select items? It doesn't seem like a straightforward duplicate..
    – Joachim
    Commented Oct 24 at 16:45
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    @Joachim It's the same concept (find a custom name in data tags) and the answers here are outdated. That's good enough for me.
    – pppery
    Commented Oct 24 at 17:52
  • For findability reasons I'll vote against, but note once more that I know little about Minecraft commands (only really what I've learned here :).
    – Joachim
    Commented Oct 25 at 8:12

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The following will test for a piece of paper renamed to "Card" in the player's inventory:

/testfor @a {Inventory:[{id:"minecraft:paper",tag:{display:{Name:"Card"}}}]}

If you want to keep track of who has the card (to select them later), you can give players with the card a tag based on the NBT test:

/scoreboard players tag @a remove HasCard
/scoreboard players tag @a add HasCard {Inventory:[{id:"minecraft:paper",tag:{display:{Name:"Card"}}}]}

Running the above commands on a clock in that order will allow you to select people with the card with @a[tag=HasCard].

You can read about the NBT format for players and items on this wiki page:
https://minecraft.wiki/w/Player.dat_format

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