Don't forget about "=" and ",". 0644 would be u=rw,go=r. Also worth pointing out that this syntax isn't an extension; it's defined by POSIX and widely supporte

Don't forget about "=" and ",". 0644 would be u=rw,go=r. Also worth pointing out that this syntax isn't an extension; it's defined by POSIX and widely supported.[1] People like to add a positional syntax as described in the article (e.g. "rw-r--r--") to their ad hoc utilities, but it's not nearly as powerful. [1] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/chmod.html#tag_20_17_13 https://pubs.opengroup.org/onlinepubs/9699919799/utilities/c...