From mboxrd@z Thu Jan 1 00:00:00 1970 From: ron@ronnatalie.com (Ronald Natalie) Date: Fri, 3 Feb 2012 11:06:13 -0500 Subject: [TUHS] Understanding the /bin, /sbin, /usr/bin, /usr/sbin Split In-Reply-To: <20120203162216.504c4bb7@cnb.csic.es> References: <20120201121214.55c73577@cnb.csic.es> <4F2A907D.9000000@fastmail.us> <89159FF1-5521-4890-A5F0-30DC9E5B7EC9@bsdimp.com> <20120202173623.GQ30634@mercury.ccil.org> <52BD3851-95AF-4DFC-8728-9F2DB1E1614C@bsdimp.com> <0D449762-FD45-4528-B46E-AEA962E6B7CA@tfeb.org> <20120203162216.504c4bb7@cnb.csic.es> Message-ID: On Feb 3, 2012, at 10:22 AM, Jose R. Valverde wrote: > > There was a reason to separate user data from system data to avoid > the system disk from becoming unusable by a misbehaving user. But this wasn't practically done in the early UNIX. Even much that was in /usr was required for normal system operation and there was stuff that got left on the root that was within the user's ability to hose up. I was system administrator of a V6 UNIX that was used in a University setting in the late 70's. People banging on the disks was the least of my issues. There were far more fun ways to crash UNIX (and even PDP-11's in general), break security, etc... that I ran around trying to forestall. In fact our /usr was on the root disk. We had two "user" home directory drives /sys1 and /sys2 on two more RK05's. My first quota as a student was 8 blocks (4K). I supplemented that at first with a dectape (half a megabyte) and then with my own RK05 pack (we reserved two drives for user mounted volumes). We swapped to an RF11 fixed head disk of about a megabyte. The fun one was people trying to ascribe meanings to the "acronyms" on the kernel disk (KEN and DMR).