Once we create the Scratch Org using the sfdx command, for example the below, we will get the org id and the username.

Sample sfdx command to create Scratch org:

sfdx force:org:create -f project-scratch-def.json --nonamespace

Sample Message:

Successfully created scratch org: 00DXXXXXXXXXXXXXXX, username: [email protected].

We can use sfdx force:org:open -u command to open the Scratch org.

Example:

sfdx force:org:open -u [email protected]