I think what Go's subprocess stuff needs most is better examples. There aren't a lot of examples out there yet. For example, I saw one guy on StackOverflow use a complicated Reader thread to print a subprocess' output to stdout, when all he had to do was set Command#Stdout to os.stdout.

I hope that I'm not assuming too much here (maybe you really did need bufio for your code), but in a lot of cases you don't need it. Like if you want to supply stdin to a process, just use Command#Stdin = strings.NewReader("what I want to send to stdin"). For getting the command output, it's often enough to just call Command#CombinedOutput and cast to a string-- no bufio required unless you're doing something fancy.

I wrote some utility code that might or might not be helpful: https://github.com/cmccabe/test2/blob/master/subprocess.go