Date: Fri, 5 Jan 2001 08:31:59 -0600 (CST) From: Mike Meyer <mwm@mired.org> To: 01031149@3web.net Cc: questions@freebsd.org Subject: Re: system management Message-ID: <14933.56031.736924.150622@guru.mired.org> In-Reply-To: <133951769@toto.iv>
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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. <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
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