Date: Fri, 25 May 2012 17:52:04 +0100 From: Chris Rees <crees@FreeBSD.org> To: RW <rwmaillists@googlemail.com> Cc: ports@freebsd.org Subject: Re: portdowngrade and meta ports Message-ID: <CADLo83-G7P8aVHJ0CzajO4p1VVJdYxBvgS4f-QO-m0Jg6eFQ_w@mail.gmail.com> In-Reply-To: <20120525140958.65863f97@gumby.homeunix.com> References: <alpine.BSF.2.00.1205241335190.22032@abbf.ynefrvtuareubzr.pbz> <CADLo838ER8kAS276HTyEBFsW=UmjbcBKMrAjfzyJ%2B=JZt-F%2BtA@mail.gmail.com> <CADLo83_qqGmqkQR54DKa=RemB01zGniREowMzTH7t7c2yzTO6w@mail.gmail.com> <20120525140958.65863f97@gumby.homeunix.com>
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On 25 May 2012 14:09, RW <rwmaillists@googlemail.com> wrote: > On Thu, 24 May 2012 22:43:08 +0100 > Chris Rees wrote: > > >> For the archive-- just thought-- even though I did a typo there, >> DON'T use: >> >> mv file file.bak && echo something > file >> >> at least with csh, file will be clobbered before mv gets to it.... > > I tried that in bash and csh and it worked correctly in both. > > e.g. in csh: > > =A0%echo nothing > foo > =A0%mv foo bar && echo something > foo > =A0%cat foo > =A0something > =A0%cat bar > =A0nothing > > If a shell supports short-circuiting then mv must complete before echo > can start, so I don't see how it can fail unless the shell opens the > file before it runs mv. > > Are you perhaps mixing this up with what happens with: > > =A0cat foo bar > foo Perhaps. Just being overcautious, sorry :) Chris
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