doc

go doc
godoc

If both a library package and a command with the same name exists, using the prefix cmd/ will force documentation on the command rather than the library package.

If the -src flag is specified, it prints the exported interface of a package in Go source form, or the implementation of a specific exported language entity.

Examples

godoc fmt                # For package fmt
godoc fmt Printf         # For fmt.Printf
godoc cmd/go             # Force documentation for the go command
godoc -src fmt           # fmt package interface in Go source form
godoc -src fmt Printf    # Implementation of fmt.Printf

Run a web server and present the documentation as a web page.

$ godoc -http=:8000