usageFooter property
An optional footer for usage.
If a subclass overrides this to return a string, it will automatically be added to the end of usage.
Implementation
@override
String get usageFooter => '''\n
Examples
Update an environment variable called SERVICE_EMAIL with a new value.
\$ scloud variable update SERVICE_EMAIL "noreply@example.com"
To update the variable from a file, use the --from-file option.
The full content of the file will be used as the value.
\$ scloud variable update SERVICE_EMAIL --from-file email.txt
''';