---
layout: default
navsection: userguide
-navmenu: Reference
title: "Command line interface"
...
-h1. Reference: Command Line Interface
-
*First, you should be "logged into an Arvados VM instance":{{site.baseurl}}/user/getting_started/ssh-access.html#login, and have a "working environment.":{{site.baseurl}}/user/getting_started/check-environment.html*
h3. Usage
h4. Global options
-- @--format=json@ := Output response as JSON
+- @--format=json@ := Output response as JSON. This is the default format.
+
- @--format=yaml@ := Output response as YAML
+
- @--format=uuid@ := Output only the UUIDs of object(s) in the API response, one per line.