Add "operator unseal" command documentation

website/source/docs/commands/operator/unseal.html.md

@@ -0,0 +1,54 @@
+---
+layout: "docs"
+page_title: "operator unseal - Command"
+sidebar_current: "docs-commands-operator-unseal"
+description: |-
+  The "operator unseal" allows the user to provide a portion of the master key
+  to unseal a Vault server.
+---
+
+# operator unseal
+
+The `operator unseal` allows the user to provide a portion of the master key to
+unseal a Vault server. Vault starts in a sealed state. It cannot perform
+operations until it is unsealed. This command accepts a portion of the master
+key (an "unseal key").
+
+The unseal key can be supplied as an argument to the command, but this is
+not recommended as the unseal key will be available in your history:
+
+```text
+$ vault operator unseal IXyR0OJnSFobekZMMCKCoVEpT7wI6l+USMzE3IcyDyo=
+```
+
+Instead, run the command with no arguments and it will prompt for the key:
+
+```text
+$ vault operator unseal
+Key (will be hidden): IXyR0OJnSFobekZMMCKCoVEpT7wI6l+USMzE3IcyDyo=
+```
+
+For more information on sealing and unsealing, please the [seal concepts
+page](/docs/concepts/seal.html).
+
+
+## Examples
+
+Provide an unseal key:
+
+```text
+$ vault operator unseal
+Key (will be hidden):
+Sealed: false
+Key Shares: 1
+Key Threshold: 1
+Unseal Progress: 0
+```
+
+## Usage
+
+The following flags are available in addition to the [standard set of
+flags](/docs/commands/index.html) included on all commands.
+
+- `-reset` `(bool: false)` - Discard any previously entered keys to the unseal
+  process.