Date: Sat, 19 Dec 2009 20:43:01 +0000 From: Anton Shterenlikht <mexas@bristol.ac.uk> To: Warren Block <wblock@wonkity.com> Cc: Anton Shterenlikht <mexas@bristol.ac.uk>, freebsd-questions@freebsd.org Subject: Re: editing a binary file Message-ID: <20091219204301.GA9957@mech-cluster241.men.bris.ac.uk> In-Reply-To: <alpine.BSF.2.00.0912171820130.53881@wonkity.com> References: <20091218005102.GA51064@mech-cluster241.men.bris.ac.uk> <alpine.BSF.2.00.0912171820130.53881@wonkity.com>
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On Thu, Dec 17, 2009 at 06:38:04PM -0700, Warren Block wrote: > On Fri, 18 Dec 2009, Anton Shterenlikht wrote: > > > I'm creating binary files in fortran. > > Fortran adds 4 byte record delimiters at the beginning > > and the end of each record, which, in the case of a binary > > file, is just at the beginning and at the end of the file. > > I need to delete these record delimiters, because the > > software I use to visualise the binary files interprets > > them as data. But I don't know how. I've looked at > > hexdump and od, but those are only dumping (I think) > > file contents, and I cannot see how to edit a file with them. > > 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. thank you, that works fine: > hexdump -C fort.10 00000000 01 00 00 00 01 01 00 00 00 |.........| 00000009 > truncate -s -4 fort.10 > hexdump -C fort.10 00000000 01 00 00 00 01 |.....| 00000005 > -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 331 5944 Fax: +44 (0)117 929 4423
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