tail用法：尾巴，取文件的最后N行，默认前10行，
-n 2 取前2行-n 2,简写就是-2
-f 文件 跟踪一个文件尾部的时时变化。
克隆出一个窗口执行：循环脚本：for n in `seq 1 20`;do echo $n>>bqh.txt ;sleep 1;done
tail –f ./bqh.txt
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