website: update docs for count.index
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@ -14,7 +14,9 @@ into strings. These interpolations are wrapped in `${}`, such as
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The interpolation syntax is powerful and allows you to reference
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variables, attributes of resources, call functions, etc.
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To reference variables, use the `var.` prefix followed by the
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## Available Variables
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**To reference user variables**, use the `var.` prefix followed by the
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variable name. For example, `${var.foo}` will interpolate the
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`foo` variable value. If the variable is a mapping, then you
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can reference static keys in the map with the syntax
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@ -22,18 +24,28 @@ can reference static keys in the map with the syntax
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get the value of the `us-east-1` key within the `amis` variable
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that is a mapping.
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To reference attributes of other resources, the syntax is
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**To reference attributes of other resources**, the syntax is
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`TYPE.NAME.ATTRIBUTE`. For example, `${aws_instance.web.id}`
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will interpolate the ID attribute from the "aws\_instance"
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resource named "web".
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Finally, Terraform ships with built-in functions. Functions
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are called with the syntax `name(arg, arg2, ...)`. For example,
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to read a file: `${file("path.txt")}`. The built-in functions
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are documented below.
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**To reference outputs from a module**, the syntax is
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`MODULE.NAME.OUTPUT`. For example `${module.foo.bar}` will
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interpolate the "bar" output from the "foo"
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[module](/docs/modules/index.html).
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**To reference count information**, the syntax is `count.FIELD`.
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For example, `${count.index}` will interpolate the current index
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in a multi-count resource. For more information on count, see the
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resource configuration page.
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## Built-in Functions
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Terraform ships with built-in functions. Functions are called with
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the syntax `name(arg, arg2, ...)`. For example,
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to read a file: `${file("path.txt")}`. The built-in functions
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are documented below.
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The supported built-in functions are:
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* `concat(args...)` - Concatenates the values of multiple arguments into
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@ -42,7 +42,9 @@ resource type in the
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There are **meta-parameters** available to all resources:
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* `count` (int) - The number of identical resources to create.
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This doesn't apply to all resources.
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This doesn't apply to all resources. You can use the `${count.index}`
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[interpolation](/docs/configuration/interpolation.html) to reference
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the current count index in your resource.
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* `depends_on` (list of strings) - Explicit dependencies that this
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resource has. These dependencies will be created before this
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