How to delete immutable files

After fsck for an office box, there exists some IMMUTABLE files. The files cannot be deleted, modified even I am super-user. Asking for help with ZMX (our friend), the reference is useful: Make your files immutable which even root can’t delete. The reason is the attribute of files are setup  as immutable and with owner/group misplaced.

The command to make the file mutable: # chattr -i {files}, and it can be deleted. If some files still cannot be deleted, the final strategy is to remove ALL of its attributes. Just run # chattr -AacDdijsSu {files}, and everything works. Enjoy it. 🙂