From: Arthur Krewat <firstname.lastname@example.org> To: email@example.com Subject: Re: [TUHS] Additional groups and additional directory permissions Date: Fri, 2 Aug 2019 08:45:51 -0400 Message-ID: <firstname.lastname@example.org> (raw) In-Reply-To: <201908020835.x728ZUal026532@freefriends.org> On 8/2/2019 4:35 AM, email@example.com wrote: > [Subject line changed] > > Hi. > > Arthur Krewat <firstname.lastname@example.org>: >> There's also the setgid bit on directories, that when files are created, >> they will be in the group that the parent directory has on it. > IIRC this was a Sun invention. It was in SunOS 4.x, and may even have > been in SunOS 3.x. > >> Also, I don't think it's been mentioned, but there's the setuid bit on >> directories - otherwise known as the sticky bit. When set, even if you >> have rights to "write" the directory (meaning, delete files), you can't >> delete those owned by other users. Useful for /tmp > Also a SunOS invention, IIRC. > >> I have no idea what the timeline is for either of these features :) > Timeline is late 80s, SunOS 4.0, I believe. (Larry? :-) > > These ideas later propogated into SVR4 / Solaris, Linux and most (if not all) > the other proprietary Unixes. > Makes a lot of sense. I just fired up my Consensys SVR4.2 VirtualBox guest, and sure enough, neither the sticky bit, nor setgid work on directories. My first commercial experience with UNIX as a consultant was SunOS. I had worked on Version 6 earlier, but that was purely personal and never more than messing around with a uVAX a friend had brought home from work. thanks for the info! art k.
next prev parent reply other threads:[~2019-08-02 12:46 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-01 12:35 [TUHS] Who's behind the UNIX filesystem permission Doug McIlroy 2019-08-01 16:22 ` John P. Linderman 2019-08-01 16:35 ` Arthur Krewat 2019-08-02 8:35 ` [TUHS] Additional groups and additional directory permissions arnold 2019-08-02 11:18 ` Tony Finch 2019-08-04 6:40 ` arnold 2019-08-02 12:45 ` Arthur Krewat [this message] 2019-08-02 13:06 ` Clem Cole 2019-08-02 13:28 ` Clem Cole 2019-08-02 19:00 ` Thomas Paulsen 2019-08-01 17:01 ` [TUHS] Who's behind the UNIX filesystem permission Nemo Nusquam 2019-08-01 18:26 ` Arthur Krewat 2019-08-01 20:14 ` Lyndon Nerenberg 2019-08-01 21:23 ` Dave Horsfall 2019-08-02 19:44 [TUHS] Additional groups and additional directory permissions Norman Wilson 2019-08-10 4:02 Kirk McKusick 2019-08-10 6:02 ` Thomas Paulsen
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