Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Project Setup
Authorization
Scratch Orgs
Development
Create a Lightning App and Components
Create an Apex Class
Track Changes Between the Project and Scratch Org
Testing
View Apex Debug Logs
Build and Release Your App
Develop Second-Generation Packages (Beta)
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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View Apex Debug Logs

Apex debug logs can record database operations, system processes, and errors that occur when executing a transaction or running unit tests in your scratch org. You can use the Salesforce CLI to view the debug logs.
  1. Open your scratch org by running force:org:open. If you have not set a default username, specify the scratch org’s username or alias with the -u parameter.
  2. Under the quick access menu (Lightning Experience) or your name (Salesforce Classic), click Developer Console. Opening the Developer Console starts a listener that is required by the force:apex:log commands.
  3. If necessary, run Apex tests to generate some debug logs. 
    1sfdx force:apex:test:run
  4. Get a list of the debug logs. 
    1sfdx force:apex:log:list
2
3APPLICATION  DURATION (MS)  ID                  LOCATION   SIZE (B)  LOG USER   OPERATION        REQUEST  START TIME                STATUS
4───────────  ─────────────  ──────────────────  ─────────  ────────  ─────────  ───────────────  ───────  ────────────────────────  ───────
5Unknown      1143           07L9A000000aBYGUA2  SystemLog  23900     User User  ApexTestHandler  Api      2017-09-05T22:58:57+0000  Success
  5. View a debug log by passing its ID to the force:apex:log:get command. 
    1sfdx force:apex:log:get --logid 07L9A000000aBYGUA2
2
338.0 APEX_CODE,FINEST;APEX_PROFILING,INFO;CALLOUT,INFO;DB,INFO;SYSTEM,DEBUG;VALIDATION,INFO;VISUALFORCE,INFO;WAVE,INFO;WORKFLOW,INFO
415:58:57.3 (3717091)|USER_INFO|[EXTERNAL]|0059A000000TwPM|test-ktjauhgzinnp@your_company.net|Pacific Standard Time|GMT-07:00
515:58:57.3 (3888677)|EXECUTION_STARTED
615:58:57.3 (3924515)|CODE_UNIT_STARTED|[EXTERNAL]|01p9A000000FmMN|RejectDuplicateFavoriteTest.acceptNonDuplicate
715:58:57.3 (5372873)|HEAP_ALLOCATE|[72]|Bytes:3
8...