See: - [OS X](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/chflags.2.html) - [FreeBSD](https://www.freebsd.org/cgi/man.cgi?query=chflags&sektion=1) - [OpenBSD](https://man.openbsd.org/chflags.1) - [Linux](https://linux.die.net/man/1/chattr), also see [wiki](https://en.wikipedia.org/wiki/Chattr) - [Windows](https://en.wikipedia.org/wiki/ATTRIB) [Overview](https://en.wikipedia.org/wiki/File_attribute). Currently missing completely.
See:
Overview. Currently missing completely.