Modifying file permissions in Linux is called "Operation not permitted".

May 12, 202390

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The file /etc/sysctl.conf has the "i" attribute, which means it cannot be modified or deleted, even by the root user. To resolve this, the "i" attribute needs to be removed using the command "chattr -i /etc/sysctl.conf". After removing the attribute, the file can be modified and deleted.

Reason: Files with the i attribute cannot be modified.

First, when executing chmod 777 /etc/sysctl.conf, an error will be thrown: chmod: changing permissions of '/etc/sysctl.conf': Operation not permitted.

2. Then, execute the command lsattr /etc/sysctl.conff to see the current file's attributes.

3. It can be observed that the current file has the i attribute. By referring to the command's help documentation, it can be seen that files with the i attribute cannot be modified or even deleted, even by the root user.

4. Therefore, the corresponding solution is to remove the i attribute from the file. Remove the i attribute: chattr -i /etc/sysctl.conf.

5. Then, the content of this file can be modified. At this point, the file can be deleted and written to using rm.