From owner-freebsd-questions Fri Jan 5 8:27:22 2001 From owner-freebsd-questions@FreeBSD.ORG Fri Jan 5 08:27:20 2001 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from harumscarum.mr.itd.umich.edu (harumscarum.mr.itd.umich.edu [141.211.125.17]) by hub.freebsd.org (Postfix) with ESMTP id C655C37B402 for ; Fri, 5 Jan 2001 08:27:19 -0800 (PST) Received: from tim.elnsng1.mi.home.com (c1129767-a.elnsng1.mi.home.com [24.183.248.20]) by harumscarum.mr.itd.umich.edu (8.9.3/3.3s) with SMTP id LAA19745; Fri, 5 Jan 2001 11:27:16 -0500 (EST) From: Tim McMillen To: Mike Meyer , 01031149@3web.net Subject: Re: system management Date: Fri, 5 Jan 2001 11:29:57 -0500 X-Mailer: KMail [version 1.1.99] Content-Type: text/plain; charset="us-ascii" Cc: questions@FreeBSD.ORG References: <14933.56031.736924.150622@guru.mired.org> In-Reply-To: <14933.56031.736924.150622@guru.mired.org> MIME-Version: 1.0 Message-Id: <01010511285600.02401@tim.elnsng1.mi.home.com> Content-Transfer-Encoding: 8bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Friday January 05, 2001 09:31, Mike Meyer wrote: > Duke Normandin <01031149@3web.net> types: > > On 4 Jan 01 at 10:34, Mike Meyer wrote: > > >> But, can we really in FreeBSD update a 3.X release to an 4.X or > > >> 5.X doing a CVSUP and then a make world ? > > > > > >Yes. If you're going from an a.out system to an elf system, you'll > > >need to do a "make ugprade" as well. > > > > I've waited a long time for an opportunity to ask about what the > > "a.out" / "elf" systems are all about. Would you be so kind....? > > Tia! > > Two different formats for executables - among other things. a.out > was the original (well, it dates back to v6) Unix executable format. > Those were just loaded and executed. The "magic number" they started > with was a branch around the executable header information. ELF > provides a lot more flexibility (for instance, both link and shared > libraries and core files can be stored as ELF files), but requires > more support from the kernel exec call. Nice explanation. (In other words I that don't know that much about it could understand the explanation. :) There's also more info in the FAQ http://www.freebsd.org/FAQ/book.html#AOUT-ELF Tim > > -- > Mike Meyer http://www.mired.org/home/mwm/ > Independent WWW/Perforce/FreeBSD/Unix consultant, email for more > information. > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message