Date: Fri, 18 Dec 2009 01:29:18 +0000 From: Anton Shterenlikht <mexas@bristol.ac.uk> To: Rolf Nielsen <listreader@lazlarlyricon.com> Cc: Anton Shterenlikht <mexas@bristol.ac.uk>, freebsd-questions@freebsd.org Subject: Re: editing a binary file Message-ID: <20091218012918.GA71118@mech-cluster241.men.bris.ac.uk> In-Reply-To: <4B2AD666.9090404@lazlarlyricon.com> References: <20091218005102.GA51064@mech-cluster241.men.bris.ac.uk> <4B2AD666.9090404@lazlarlyricon.com>
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On Fri, Dec 18, 2009 at 02:09:58AM +0100, Rolf Nielsen wrote: > 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. > > > > Any advice? > > > > many thanks > > anton > > > > Hello Anton, > > My bet would be /usr/ports/editors/hexedit. Been a while since I've used > it, but AFAIR, it has a curses or a curses like interface, and it's > fairly simple to use, yet sufficiently powerful for most normal binary > editing. If you want a GUI, I believe gnome (and probably KDE as well) > has its own hex editor. thank you. hexedit does the job on small files, but is quite clunky. If I've a xGB file and I need to delete the first and the last record, this becomes quite hard, if at all possible. I didn't appreciate it's not that simple. Perhaps I can read a file with C and write back? I can't remember if C supports binary files, and whether it also writes some record delimiters. many thanks anton -- 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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