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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Run CLI Commands on macOS Sierra (Version 10.12)

Some users who upgrade to macOS Sierra can’t execute CLI commands. This is a general problem and not isolated to Salesforce DX. To resolve the issue, reinstall your Xcode developer tools.

Execute this command in Terminal:

1xcode-select --install

If you still can’t execute CLI commands, download the Command Line Tools (macOS sierra) for Xcode 8 package from the Apple Developer website.