Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Enable Dev Hub Features in Your Org
Project Setup
Authorization
Authorize an Org Using the Web Server Flow
Authorize an Org Using the JWT Bearer Flow
Create a Private Key and Self-Signed Digital Certificate
Create a Connected App for Your Dev Hub Org
Use an Existing Access Token Instead of Authorizing
Authorization Information for an Org
Log Out of an Org
Metadata Coverage
Scratch Orgs
Sandboxes
Development
Build and Release Your App
First-Generation Managed Packages
Second-Generation Managed Packages
Unlocked Packages
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Use an Existing Access Token Instead of Authorizing

When you authorize into an org using the auth commands, the Salesforce CLI takes care of generating and refreshing all tokens, such as the access token. But sometimes you want to run a few CLI commands against an existing org without going through the entire authorization process. In this case, you must provide the access token and instance URL of the org.
  1. Use config:set to set the instanceUrl config value to the Salesforce instance that hosts the existing org to which you want to connect. 
    1sfdx config:set instanceUrl=https://na35.salesforce.com
  2. When you run the CLI command, use the org’s access token as the value for the --targetusername parameter rather than the org’s username. 
    1sfdx force:mdapi:deploy --deploydir <md-dir> --targetusername <access-token>

The CLI does not store the access token in its internal files. It uses it only for this CLI command run.