Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Project Setup
Authorization
Scratch Orgs
Development
Build and Release Your App
Develop Second-Generation Packages (Beta)
Continuous Integration
Troubleshoot Salesforce DX
CLI Version Information
Run CLI Commands on macOS Sierra (Version 10.12)
Error: No defaultdevhubusername org found
Unable to Work After Failed Org Authorization
Error: Lightning Experience-Enabled Custom Domain Is Unavailable
Limitations for Salesforce DX
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CLI Version Information

Use these commands to view version information about the Salesforce DX CLI.
1sfdx --version           // CLI version
2sfdx plugins             // SalesforceDX plugin version
3sfdx force --version     // Salesforce API version used by the CLI