tail命令
作用：從文件的尾部查看，跟head命令作用相反，參數也差不多，默認顯示后面10行
格式：
tail [option] [file]
-n : 顯示行數
-c<字節數>
ghostwu@dev:~/linux/more$ cat ghostwu.txt | tail file thank you file thank you file thank you file thank you file thank you file thank you and you? ghostwu@dev:~/linux/more$ tail -2 ghostwu.txt and you? ghostwu@dev:~/linux/more$ tail -c 3 ghostwu.txt u?