gcloud version

NAME
gcloud version - print version information for Google Cloud CLI components
SYNOPSIS
gcloud version [GCLOUD_WIDE_FLAG]
DESCRIPTION
Print version information for Google Cloud CLI components.
EXAMPLES
To print the version information for each installed Google Cloud CLI components and print a message if updates are available, run:
gcloud version
GCLOUD WIDE FLAGS
These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.

Run $ gcloud help for details.