Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Enable Dev Hub Features in Your Org
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Sandboxes
Track Changes Between Your Project and Org
Development
Develop Against Any Org
Assign a Permission Set
Ways to Add Data to Your Org
Create Lightning Apps and Aura Components
Create Lightning Web Components
Create an Apex Class
Create an Apex Trigger
Run Apex Tests
Build and Release Your App
First-Generation Managed Packages
Second-Generation Managed Packages
Partner Licensing Platform (Developer Preview)
Unlocked Packages
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Create an Apex Trigger

Use Apex triggers to perform custom actions before or after a change to a Salesforce record, such as an insertion, update, or deletion. You can create Apex triggers from the CLI.
By default, the trigger is created in the directory from which you run the command. The standard DX project template assumes you’ll create your Apex triggers in the <package directory>/force-app/main/default/triggers directory. To create triggers in this directory, change to it before running the command. 
1sfdx force:apex:trigger:create -n mytrigger

If you’re in a different directory, indicate the -d parameter to specify the absolute or relative path to the directory where you want to save your Apex class files. If you don’t indicate an absolute or a relative path and the directory doesn’t exist, the CLI attempts to create it for you. 

1sfdx force:apex:trigger:create -n mytrigger -d ../force-app/main/default/triggers

Generate a skeleton trigger file by executing force:apex:trigger:create.

  • Use the -s parameter to specify the sObject associated with this trigger, such as Account.
  • Use the -e parameter to specify the triggering events, such as before delete or after insert.
1sfdx force:apex:trigger:create -n mytrigger -s Account -e 'before insert,after insert' -d ../force-app/main/default/triggers

The command generates two files.

  • mytrigger.trigger-meta.xml—metadata format
  • mytrigger.trigger—Apex trigger source file