Date: Tue, 23 Oct 2007 20:26:07 +0330 From: "Bahman M." <b.movaqar@adempiere.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: juri_mian@yahoo.com, freebsd-questions@freebsd.org Subject: Re: oflag option in GNU dd - equivalent in FreeBSD dd ? Message-ID: <20071023202607.639f0988@attila> In-Reply-To: <20071023163135.GA74788@dan.emsphone.com> References: <20071023164246.13be9d63@attila> <200710231516.l9NFGSVL038402@lurza.secnetix.de> <20071023163135.GA74788@dan.emsphone.com>
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On 2007-10-23 Dan Nelson wrote: > In the last episode (Oct 23), Oliver Fromme said: > > Bahman M. <b.movaqar@adempiere.org> wrote: > > > On 2007-10-22 Juri Mianovich wrote: > > > > I am used to using this command in Linux, using GNU > > > > dd: > > > > > > > > dd if=/blah of=/bleh oflag=append conv=notrunc > > > > > > > > The problem is, FreeBSD 'dd' does not understand the > > > > "oflag" argument. > > > > > > > > Is there some equivalent in the FreeBSD 'dd' syntax > > > > that I can use, or am I forced to install GNU utils ? > > > > Of course, the easiest way is to do this: > > > > $ dd if=/blah >> /bleh > > > > If you cannot do that, please explain why. If you know > > your reason, there might be an alternative way to do it. > > > > > dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d > > > ' ' -` > > > > > > I don't know if any simpler way is possible (anyone?). > > > > $ dd if=/blah of=/bleh conv=notrunc seek=$(stat -f%z /bleh) > > I don't think that will work, since seek's argument is in blocks. > Even if you divide by 512 (or whatever you decide to set bs=), if the > file you're appending do isn't a multiple of the blocksize, you'll > end up chopping part of the end off. > Good point! The following should cover that: sh$ dd if=/blah of=/bleh conv=notrunc bs=1 seek=$(stat -f%z /bleh) or tcsh% dd if=/blah of=/bleh conv=notrunc bs=1 seek=`stat -f%z /bleh` I wonder if bs=1 can cause any slow down when working with large files? Bahman
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