Newbie Question About System Update
Warner Losh
imp at bsdimp.com
Tue Apr 19 15:36:17 PDT 2005
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.
Warner
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