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# Topic: installation

| Tool | Description |
|--------|-------------|
| [g.extension.all](g.extension.all.md) | Rebuilds or removes all locally installed GRASS Addons extensions. By default only extensions built against different GIS Library are rebuilt. |
| [g.extension](g.extension.md) | Maintains GRASS Addons extensions in local GRASS installation. Downloads and installs extensions from GRASS Addons repository or other source into the local GRASS installation or removes installed extensions. |

*See also the corresponding keyword for additional references:*

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