因为vim编辑文档未保存。再次编辑同一个文件时出现报错的解决

E325: ATTENTION
Found a swap file by the name ".oldboy.txt.swp"
owned by: root dated: Sun Dec 23 22:41:46 2018
file name: /oldboy/oldboy.txt
modified: YES
user name: root host name: oldboyedu01-nb
process ID: 8244 (still running)
While opening file "oldboy.txt"
dated: Sun Dec 23 22:47:55 2018
NEWER than swap file!

(1) Another program may be editing the same file. If this is the case,
be careful not to end up with two different instances of the same
file when making changes. Quit, or continue with caution.
(2) An edit session for this file crashed.
If this is the case, use ":recover" or "vim -r oldboy.txt"
to recover the changes (see ":help recovery").
If you did this already, delete the swap file ".oldboy.txt.swp"
to avoid this message.

Swap file ".oldboy.txt.swp" already exists!

解决方法：

1. 删除以上报错信息最后一行提示的".oldboy.txt.swp"
   命令：rm -f .oldboy.txt.swp
   注意：如果自定义了alias。
   命令则是：m -f .oldboy.txt.swp

2. 重新编辑：vim oldboy.txt下的内容
3. esc后：wq 保存。