Clive, 2nd ed. User's manual. Section 2 
SYNOPSYS

import "clive/snarf"

func Get() (string, error)
func Set(s string) error

DESCRIPTION

Access to the system clipboard.

FUNCTIONS

func Get() (string, error)
    Get the clipboard text

func Set(s string) error
    Set the clipbard text

BUGS

BUG: As of now, only for darwin

User's manual, 2nd ed. Section 2