code: func sysctl(name, value string) (string, error) {
  	return sysctlByComponents(strings.Split(name, "."), value)
  }
docs: // sysctl sets the named sysctl to the value specified and returns its
  // original value as a string. Note that this cannot be used if a sysctl
  // component includes a period it its name - in that case use
  // sysctlByComponents instead.