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E45: ‘readonly’ option is set (add ! to override)

该错误为当前用户没有权限对文件作修改

有三种可能：

1 . 该错误为当前用户没有权限对文件作修改,你有权限修改文件吗？如果是root权限，可以:wq! 强行保存退出；

2 . 该文件没有正确保存退出，正在打开状态，请别人关闭后再保存；

3 . 若该文件所有人都关闭了，提示有的人没有关闭，则删除该文件的临时文件则可以正常打开、修改、保存；

有文件未关闭的显示：

E325: ATTENTION
Found a swap file by the name ".application.properties.swp"
          owned by: wasadmin   dated: Tue Nov 29 14:31:30 2016
         file name: /opt/IBM/WebSphere/AppServer/profiles/AppSrv03/installedApps/B2C-WAP-API-2Node03Cell/airchina_war.ear/airchina.war/WEB-INF/config/application.properties
          modified: no
         user name: wasadmin   host name: B2C-WAP-API-2
        process ID: 9278 (still running)
While opening file "application.properties"
             dated: Tue Nov 29 12:48:05 2016

(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 application.properties"
    to recover the changes (see ":help recovery").
    If you did this already, delete the swap file ".application.properties.swp"
    to avoid this message.

Swap file ".application.properties.swp" already exists!
[O]pen Read-Only, (E)dit anyway, (R)ecover, (Q)uit, (A)bort:

希望对你有帮助，祝你有一个好心情，加油！

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