website: document console command

website/source/docs/commands/console.html.markdown

@@ -0,0 +1,62 @@
+---
+layout: "docs"
+page_title: "Command: console"
+sidebar_current: "docs-commands-console"
+description: |-
+  The `terraform console` command creates an interactive console for using [interpolations](/docs/configuration/interpolation.html).
+---
+
+# Command: console
+
+The `terraform console` command creates an interactive console for
+using [interpolations](/docs/configuration/interpolation.html).
+
+## Usage
+
+Usage: `terraform console [options] [dir]`
+
+This opens an interactive console for experimenting with interpolations.
+This is useful for testing interpolations before using them in configurations
+as well as interacting with an existing [state](/docs/state/index.html).
+
+If a state file doesn't exist, the console still works and can be used
+to experiment with supported interpolation functions. Try entering some basic
+math such as `1 + 5` to see.
+
+The `dir` argument can be used to open a console for a specific Terraform
+configuration directory. This will load any state from that directory as
+well as the configuration. This defaults to the current working directory.
+The `console` command does not require Terraform state or configuration
+to function.
+
+The command-line flags are all optional. The list of available flags are:
+
+* `-state=path` - Path to the state file. Defaults to "terraform.tfstate".
+  A state file doesn't need to exist.
+
+## Scripting
+
+The `terraform console` command can be used in non-interactive scripts
+by piping newline-separated commands to it. Only the output from the
+final command is outputted unless an error occurs earlier.
+
+An example is shown below:
+
+```
+$ echo "1 + 5" | terraform console
+6
+```
+
+## Remote State
+
+The `terraform console `command will read configured state even if it
+is [remote](/docs/state/remote/index.html). This is great for scripting
+state reading in CI environments or other remote scenarios.
+
+After configuring remote state, run a `terraform remote pull` command
+to sync state locally. The `terraform console` command will use this
+state for operations.
+
+Because the console currently isn't able to modify state in any way,
+this is a one way operation and you don't need to worry about remote
+state conflicts in any way.

website/source/layouts/docs.erb

@@ -67,6 +67,10 @@
 					<a href="/docs/commands/apply.html">apply</a>
 					</li>
 
+					<li<%= sidebar_current("docs-commands-console") %>>
+					<a href="/docs/commands/console.html">console</a>
+					</li>
+
 					<li<%= sidebar_current("docs-commands-destroy") %>>
 					<a href="/docs/commands/destroy.html">destroy</a>
 					</li>