Newbie Question About System Update
wmoran at potentialtech.com
Tue Apr 19 16:17:38 PDT 2005
On Tue, 19 Apr 2005 16:34:37 -0600 (MDT)
Warner Losh <imp at bsdimp.com> wrote:
> From: Bill Moran <wmoran at potentialtech.com>
> Subject: Re: Newbie Question About System Update
> Date: Tue, 19 Apr 2005 16:32:37 -0400
> > Chuck Swiger <cswiger at 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.
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