Date: Mon, 5 Jul 2004 13:55:00 -0700 (PDT) From: Joe Schmoe <non_secure@yahoo.com> To: freebsd-questions@freebsd.org Subject: making files opposite from themselves (100% change) Message-ID: <20040705205500.30396.qmail@web53306.mail.yahoo.com>
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Hi, I want to do some benchmarking and speed testing of rsync and UFS snapshots by taking existing files, doing rsyncs and snapshots of them and their filesystem, and then _changing_ those files by a certain percent difference, and rsyncing/snapshotting again. So the question is, how do I take a given file and make it 100% different from itself (but maintain its size and place on disk) ? I could just output /dev/zero to it, but that would leave unchanged all the bits that were aleady zero. So how do I flip the bits of an entire file ? Further, is there a good command line that will flip the bits of some percentage of the file ? thanks. __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail
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