Date: Fri, 5 Jan 2001 11:29:57 -0500 From: Tim McMillen <timcm@umich.edu> To: Mike Meyer <mwm@mired.org>, 01031149@3web.net Cc: questions@FreeBSD.ORG Subject: Re: system management Message-ID: <01010511285600.02401@tim.elnsng1.mi.home.com> In-Reply-To: <14933.56031.736924.150622@guru.mired.org> References: <14933.56031.736924.150622@guru.mired.org>
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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 > -- > Mike Meyer <mwm@mired.org> 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
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