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From: Arthur Krewat <krewat@kilonet.net>
To: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] Additional groups and additional directory permissions
Date: Fri, 2 Aug 2019 08:45:51 -0400
Message-ID: <290b6d92-2e4a-248f-63b0-ab663f49ea65@kilonet.net> (raw)
In-Reply-To: <201908020835.x728ZUal026532@freefriends.org>



On 8/2/2019 4:35 AM, arnold@skeeve.com wrote:
> [Subject line changed]
>
> Hi.
>
> Arthur Krewat <krewat@kilonet.net>:
>> 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.


  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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