linux下vi操作Found a swap file by the name

当我在linux下用vi打开Test.java文件时

会出现如下信息：

E325: ATTENTION  
Found a swap file by the name ".Test.java.swp"  

         owned by: root   dated: Wed Dec  7 13:52:56 2011  
         file name: /var/tmp/Test.java  
         modified: YES  
         user name: root   host name: localhost  
         process ID: 26153 (still running)  
While opening file "Test.java"  
             dated: Wed Dec  7 14:00:46 2011  
      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.java"  
    to recover the changes (see ":help recovery").  
    If you did this already, delete the swap file ".Test.java.swp"  
    to avoid this message.  
"Test.java" 11L, 237C  
Press ENTER or type command to continue  

原因是我之前有一次使用 vi 操作Test.java文件时出现了异常中断，所以在当前目录下产生了一个.Test.java.swp文件

但是我使用 ls 命令查看该目录下，却发现没有这个文件，后来使用 ls -a 命令查看才知道Test.java.swp是一个隐藏文件。

注：以.开头的文件就是隐藏文件

当我把该隐藏文件删除后再次打开就没有上面的警告了。

rm .Test.java.swp # 然后输入y确认删除