linux 下文件 readonly

當我在linux下用vi打開Test.java文件時

[root@localhost tmp]# vi Test.java

會出現如下信息：

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文件時出現了異常中斷，所以在當前目錄下產生了一個.Test.java.swp文件

但是我使用ls命令查看該目錄下，卻發現沒有這個文件，後來使用ls -a命令查看才知道Test.java.swp是一個隱藏文件。

注：以.開頭的文件就是隱藏文件

當我把該隱藏文件刪除後再次打開就沒有上面的警告了。

[root@localhost tmp]# rm .Test.java.swp

rm: remove regular file `.Test.java.swp'? y

[root@localhost tmp]#