当时我用命令view操作文件：
view test.sh
按i进入编辑模式没问题，但是准备编写，随便输入。
出现下面的问题：
E325: ATTENTION
Found a swap file by the name ".test.sh.swp"
owned by: admin dated: Sat Jun 16 16:17:47 2018
file name: ~admin/test/bash/test.sh
modified: YES
user name: admin host name: localhost.localdomain
process ID: 2731
While opening file "test.sh"
dated: Tue Jun 20 11:07:13 2017
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 test.sh"
to recover the changes (see ":help recovery").
If you did this already, delete the swap file ".test.sh.swp"
to avoid this message.
出现的原因是中途编辑文件时网络中断了，之后目录产生了一个文件 .test.sh.swp
这是一个隐藏文件，用命令 ls -a 可以查看。
解决的方法：
把该隐藏文件删除即可 rm .test.sh.swp
然后就没问题了。