gcloud-config-set
Set a property in the Google Cloud CLI configuration.
TLDR
Set the project property in the core section
$ gcloud config set project [project_id]
Set the compute zone for future operations
$ gcloud config set compute/zone [zone_name]
Disable prompting to make gcloud suitable for scripting
$ gcloud config set disable_prompts true
View the list of properties currently in use
$ gcloud config list
Unset a previously set property
$ gcloud config unset [property_name]
Create a new configuration profile
$ gcloud config configurations create [configuration_name]
Switch between different configuration profiles
$ gcloud config configurations activate [configuration_name]