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

use vi Modify file , When saving a file , Prompt: you do not have permission to modify this file “E45: ‘readonly’ option is set (add ! to override)” Solutions for .

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

The error is that the current user does not have permission to modify the file

There are three possibilities ：

1 . The error is that the current user does not have permission to modify the file , Do you have permission to modify the file ？ If it is root jurisdiction , Sure :wq! Force save to exit ;

2 . The file was not saved correctly exit , Opening status , Please close it and save it ;

3 . If the file is closed by everyone , Prompt that some people have not closed , Delete the temporary file of the file and it can be opened normally 、 modify 、 preservation ;

There is a display that the file is not closed ：

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, ecover, (Q)uit, (A)bort:

step ：

1. Press Esc key

2. Input :set noreadonly

3. Then it can be saved normally , You can type :wq To save the file .