http://techie.siigna.net/ 2012-05-19T19:34:13+00:00 http://techie.siigna.net/ http://techie.siigna.net/lib/tpl/default/images/favicon.ico text/html 2011-12-17T13:55:31+00:00 http://techie.siigna.net/doku.php/compressing_free_space_when_working_with_dd?rev=1324130131&do=diff When creating a disk image with 'dd' you'll find that there's really no way of telling 'dd' to skip free space. A 250gb partition is going to take up 250gb of space. To get around this you can fill the partition with a large file of zeroes, delete the file and 'dd' it directly afterwards while piping it to a compression utility. Creating the zeroes will drastically help compression. text/html 2011-12-17T14:02:49+00:00 http://techie.siigna.net/doku.php/forcefully_unmounting_a_device?rev=1324130569&do=diff Often when 'chroot'ed into something I accidentally leave something running in the 'chroot' and find myself unable to unmount my devices. For example. Let's say I have /dev/md0 mounted at /sysroot. I 'chroot' in and start samba. When I exit the 'chroot' and try to umount /dev/md0 I'm presented with a nice little error telling me it failed. text/html 2011-12-17T13:45:47+00:00 http://techie.siigna.net/doku.php/start?rev=1324129547&do=diff This is just a spot to collect my thoughts and projects. Content Stupid *nix Tricks text/html 2011-12-17T13:48:47+00:00 http://techie.siigna.net/doku.php/stupid_nix_tricks?rev=1324129727&do=diff * Compressing free space when working with 'dd'. * Forcefully unmounting a device. * Logging 'telnet' sessions. * Temporarily setting 'md' data offsets. * Transcoding mp4 files to flv.