Date: Fri, 18 Dec 2009 01:59:36 -0800 From: perryh@pluto.rain.com To: wblock@wonkity.com, glarkin@freebsd.org Cc: mexas@bristol.ac.uk, freebsd-questions@freebsd.org Subject: Re: editing a binary file Message-ID: <4b2b5288.qFxIl6ScdS9yKkZj%perryh@pluto.rain.com> In-Reply-To: <4B2ADE9E.6080707@FreeBSD.org> References: <20091218005102.GA51064@mech-cluster241.men.bris.ac.uk> <alpine.BSF.2.00.0912171820130.53881@wonkity.com> <4B2ADE9E.6080707@FreeBSD.org>
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Greg Larkin <glarkin@freebsd.org> wrote: > ... > > truncate -4 myfile should get rid of the last four bytes. Maybe > > there's a similar efficient way to truncate the start of a file. > > This should do it: > > dd if=oldfile of=newfile bs=1 skip=4 Or, perhaps marginally more efficient: dd if=oldfile of=newfile bs=4 skip=1
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