tail

type TailOptions struct {
	Lines   int           // -n: number of lines to print
	Bytes   int           // -c: number of bytes to print
	Follow  bool          // -f: output appended data as file grows
	Quiet   bool          // -q: never print headers
	Verbose bool          // -v: always print headers
	Sleep   time.Duration // --sleep-interval: sleep interval for -f
	JSON    bool          // --json: output as JSON
}

type TailResult struct {
	File  string   `json:"file,omitempty"`
	Lines []string `json:"lines"`
}