Salesforce DX Developer Guide (Beta)

How Salesforce Developer Experience Changes the Way You Work (Beta)
Project Setup
Salesforce CLI Configuration and Tips
CLI Configuration Values
CLI Environment Variables
Salesforce DX Usernames and Orgs
CLI Parameter Resolution Order
Support for JSON Responses
Log Messages and Log Levels
Sample Repository on GitHub
Create a Salesforce DX Project
Create a Salesforce DX Project from Existing Source
Retrieve Source from an Existing Managed Package
Retrieve Unpackaged Source Defined in a package.xml File
Retrieve Unpackaged Source by Creating a Temporary Unmanaged Package
Convert the Metadata API Source
Link a Namespace to the Dev Hub Org
Salesforce DX Project Configuration
Authorization
Scratch Orgs
Development
Build and Release Your App
Continuous Integration
Troubleshoot Salesforce DX
Considerations for Salesforce DX (Beta)
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CLI Environment Variables

You can set environment variables to configure some CLI behaviors.
Environment Variable Description
SFDX_LOG_LEVEL Sets the level of messages that the CLI writes to the log file.
SFDX_CONTENT_TYPE All CLI commands output results in JSON format.
SFDX_USE_GENERIC_UNIX_KEYCHAIN (Linux and macOS only) Set to true if you want to use the generic Unix keychain instead of the Linux libsecret library or macOS keychain. Specify this variable when using the CLI with ssh or "headless" in a CI environment.
SFDX_AUTOUPDATE_DISABLE Set to true to disable the auto-update feature of the CLI. By default the CLI periodically checks for and installs updates.
SFDX_DOMAIN_RETRY Specifies the time, in seconds, that the CLI waits for the Lightning Experience custom domain to resolve and become available in a newly-created scratch org.

The default value is 240 (4 minutes). Set the variable to 0 to bypass the Lightning Experience custom domain check entirely.