You could use the following command to insert the new contacts and update the existing contacts: sfdx force:data:bulk:upsert -sobjecttype Contact -csvfile example. The source of the CSV file would look something like this: Id,FirstName,LastName,Phone Suppose you have a CSV file (example.csv), formatted in the following manner, containing data to be upserted into the Contact sObject: * - * The data:bulk:upsert command allows you to insert new rows and update existing rows from a CSV file. Apex Data Loader - The Apex Data Loader is a java based application that can bulk process the insert, update and delete on all object data into and build.
The Data Loader can also be used to extract data from database objects into any of the destinations mentioned above. The Salesforce CLI has data commands which allow you to manipulate records in your org. The Data Loader is an easy to use graphical tool that helps you to get your data into Salesforce objects.
