Linux lsattr chattr
I was trying to remove an old file from my computer but for some reason was unable to delete it.
When I tried to remove it I got the message “rm: cannot unlink ‘filename’: Operation not permitted”
I was logged in as root when I tried this command – again unable to move / delete the file.
The file’s permissions are “-rw-r—–“.
The file is owned by root and I was also unable to chmod the file to expand the permissions.
lsattr (filename) if a "u" and a "i" turn up its made (i)mmutable and (u)ndeletable.
chattr -iu (filename) to undo this.