command

type Command interface {
	Start() error
	Wait() error

	StdinPipe() (io.WriteCloser, error)
	StdoutPipe() (io.ReadCloser, error)
	StderrPipe() (io.ReadCloser, error)

	Kill()
}

type CommandInfo struct {
	Prog string
	Args []string
	Env  []string
}

type Commander interface {
	NewCommand() Command
}