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@@ -269,6 +269,18 @@ By default it points to `/home/<user>/.composer` on *nix,
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`/Users/<user>/.composer` on OSX and
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`C:\Users\<user>\AppData\Roaming\Composer` on Windows.
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+#### COMPOSER_HOME/config.json
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+
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+You may put a `config.json` file into the location which `COMPOSER_HOME` points
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+to. Composer will merge this configuration with your project's `composer.json`
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+when you run the `install` and `update` commands.
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+
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+This file allows you to set [configuration](04-schema.md#config) and
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+[repositories](05-repositories.md) for the user's projects.
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+
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+In case global configuration matches _local_ configuration, the _local_
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+configuration in the project's `composer.json` always wins.
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+
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### COMPOSER_PROCESS_TIMEOUT
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This env var controls the time composer waits for commands (such as git
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till