Date: Tue, 19 Apr 2005 16:34:37 -0600 (MDT) From: Warner Losh <imp@bsdimp.com> To: wmoran@potentialtech.com Cc: freebsd-stable@freebsd.org Subject: Re: Newbie Question About System Update Message-ID: <20050419.163437.71152253.imp@bsdimp.com> In-Reply-To: <20050419163237.76a99373.wmoran@potentialtech.com> References: <20050419120053.6ad17df1.wmoran@potentialtech.com> <42655B8E.5020603@mac.com> <20050419163237.76a99373.wmoran@potentialtech.com>
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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. Warner
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