nix/doc/manual/rl-next/add-nix-state-home.md

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---
synopsis: Use envvars NIX_CACHE_HOME, NIX_CONFIG_HOME, NIX_DATA_HOME, NIX_STATE_HOME if defined
prs: [11351]
---
Added new environment variables:
- `NIX_CACHE_HOME`
- `NIX_CONFIG_HOME`
- `NIX_DATA_HOME`
- `NIX_STATE_HOME`
Each, if defined, takes precedence over the corresponding [XDG environment variable](@docroot@/command-ref/env-common.md#xdg-base-directories).
This provides more fine-grained control over where Nix looks for files, and allows to have a stand-alone Nix environment, which only uses files in a specific directory, and doesn't interfere with the user environment.