when trying to delete file, I got the rm command on ubuntu page at https://help.ubuntu.com/community/DeletingFiles. And on, this page I got the term read-only files. I have tried to google read-only file linux, but cannot find any definition about this. Could you tell me what read-only mean? Does it mean all owner, group and other have only read permission? Thank you!
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They may have different permissions. But you (the current user) have only read permission.