What you are really wanting there is to run xsel --clipboard and pipe data 
into it. Talk to your cmd.Stdin!
This is mostly straight from the StdinPipe example in the go docs:

cmd := exec.Command ("xsel","--clipboard" )
stdin, err := cmd.StdinPipe()
if err != nil {
log.Fatal(err)
}

go func() {
defer stdin.Close()
io.WriteString(stdin, "values written to stdin are passed to cmd's standard 
input and in this case end up on the X clipboard")
}()

out, err := cmd.CombinedOutput()
if err != nil {
log.Fatal(err)
}

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