Read this on the main serverless docs site¶

OpenWhisk - Deploy Function¶

The sls deploy function command deploys an individual function. This command simply compiles a deployment package with a single function handler. This is a much faster way of deploying changes in code.

serverless deploy function -f functionName

Note: Because this command is only deploying the function code, function properties such as environment variables and events will not be deployed.

Options¶

• --function or -f The name of the function which should be deployed