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jrw@wangfy:~/code/community/article$ go mod

Go mod provides access to operations on modules.

Note that support for modules is built into all the go commands,

not just 'go mod'. For example, day-to-day adding, removing, upgrading,

and downgrading of dependencies should be done using 'go get'.

See 'go help modules' for an overview of module functionality.

Usage:

        go mod <command> [arguments]

The commands are:

        download    download modules to local cache

        edit        edit go.mod from tools or scripts

        graph       print module requirement graph

        init        initialize new module in current directory

        tidy        add missing and remove unused modules

        vendor      make vendored copy of dependencies

        verify      verify dependencies have expected content

        why         explain why packages or modules are needed

Use "go help mod <command>" for more information about a command.