Date: Tue, 19 Apr 2005 19:17:35 -0400 From: Bill Moran <wmoran@potentialtech.com> To: Warner Losh <imp@bsdimp.com> Cc: freebsd-stable@freebsd.org Subject: Re: Newbie Question About System Update Message-ID: <20050419191735.3402dd0a.wmoran@potentialtech.com> In-Reply-To: <20050419.163437.71152253.imp@bsdimp.com> References: <20050419120053.6ad17df1.wmoran@potentialtech.com> <42655B8E.5020603@mac.com> <20050419163237.76a99373.wmoran@potentialtech.com> <20050419.163437.71152253.imp@bsdimp.com>
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On Tue, 19 Apr 2005 16:34:37 -0600 (MDT) Warner Losh <imp@bsdimp.com> wrote: > From: Bill Moran <wmoran@potentialtech.com> > Subject: Re: Newbie Question About System Update > Date: Tue, 19 Apr 2005 16:32:37 -0400 > > > Chuck Swiger <cswiger@mac.com> wrote: > > > Bill Moran wrote: > > > > The system can not replace programs that are in use, > > > > > > This is generally not the case. Unix lets you continue to access a file after > > > it has been deleted, so long as the process hangs on to a file descriptor. > > > This lets you replace programs in use, without running into the same problems > > > that platforms like Windows have. > > > > What you say?: > > > > bash-2.05b$ su > > Password: > > bolivia# cp /usr/sbin/cron /home/wmoran/. > > bolivia# cp /home/wmoran/cron /usr/sbin/. > > cp: /usr/sbin/./cron: Text file busy > > bolivia# > > mv /usr/sbin/cron /usr/sbin/cron- > cp /blah/cron /usr/sbin/cron > > install does this behind the scenes. I suppose I have to stand corrected. Thanks for putting me straight. -- Bill Moran Potential Technologies http://www.potentialtech.com
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