80 lines
2.1 KiB
Markdown
80 lines
2.1 KiB
Markdown
---
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layout: "docs"
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page_title: "Command: output"
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sidebar_current: "docs-commands-output"
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description: |-
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The `terraform output` command is used to extract the value of an output variable from the state file.
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---
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# Command: output
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The `terraform output` command is used to extract the value of
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an output variable from the state file.
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## Usage
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Usage: `terraform output [options] [NAME]`
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With no additional arguments, `output` will display all the outputs for
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the root module. If an output `NAME` is specified, only the value of that
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output is printed.
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The command-line flags are all optional. The list of available flags are:
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* `-json` - If specified, the outputs are formatted as a JSON object, with
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a key per output. If `NAME` is specified, only the output specified will be
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returned. This can be piped into tools such as `jq` for further processing.
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* `-state=path` - Path to the state file. Defaults to "terraform.tfstate".
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Ignored when [remote state](/docs/state/remote.html) is used.
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* `-module=module_name` - The module path which has needed output.
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By default this is the root path. Other modules can be specified by
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a period-separated list. Example: "foo" would reference the module
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"foo" but "foo.bar" would reference the "bar" module in the "foo"
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module.
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## Examples
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These examples assume the following Terraform output snippet.
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```hcl
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output "lb_address" {
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value = "${aws_alb.web.public_dns}"
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}
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output "instance_ips" {
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value = ["${aws_instance.web.*.public_ip}"]
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}
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```
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To list all outputs:
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```shell
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$ terraform output
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```
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To query for the DNS address of the load balancer:
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```shell
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$ terraform output lb_address
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my-app-alb-1657023003.us-east-1.elb.amazonaws.com
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```
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To query for all instance IP addresses:
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```shell
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$ terraform output instance_ips
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test = [
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54.43.114.12,
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52.122.13.4,
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52.4.116.53
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]
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```
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To query for a particular value in a list, use `-json` and a JSON
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command-line parser such as [jq](https://stedolan.github.io/jq/).
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For example, to query for the first instance's IP address:
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```shell
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$ terraform output -json instance_ips | jq '.value[0]'
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```
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