1：针对上面的vim_test文件，删除第7-19行
在ESC模式下，输入
:7,19d
参考文章：
https://blog.csdn.net/xueqinmax/article/details/100153229
https://blog.csdn.net/wallwind/article/details/7633356
https://blog.csdn.net/xueqinmax/article/details/100153229
https://cn.linux-console.net/?p=12251
https://blog.csdn.net/weixin_30062415/article/details/116545493
https://www.linuxprobe.com/vim-delete-lines.html