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Full Discussion: Clearing file contents
Special Forums Hardware Filesystems, Disks and Memory Clearing file contents Post 302073847 by dkaplowitz on Thursday 18th of May 2006 07:38:35 AM
Old 05-18-2006
`>filename` works for me on Solaris and Gentoo Linux (and I'm assuming every other Linux). Makes an empty, 0-byte file. The `cat filename > /dev/null` doesn't change the file since you are only catenating its contents and sending that output to /dev/null.
 

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readdvd(1)							    readdvd 1.0 							readdvd(1)

NAME
readdvd - is creating an image of your source dvd media or medias even if it has / they have corrupted blocks SYNOPSIS
readdvd [-l] [-h] readdvd -d DEVICE1 [-d DEVICE2] [-d ...] -o file.iso [-s #] [-v] [-vv] DESCRIPTION
readdvd reads even a corrupted dvd and writes the the result into a new image file on your harddisk. DEVICE
can be an IDE, SCSI, SATA, USB or FireWire connected optical drive. Not all SATA controller support all Plextor features. Linux: /dev/hdX: IDE device /dev/scdX: Linux 2.4: SATA, SCSI, USB device, or IDE device via ide-scsi emulation /dev/srX: Linux 2.6: IDE device via new ATA layer, SCSI or USB device OpenBSD/NetBSD: /dev/rcdX FreeBSD: /dev/cd: SCSI device /dev/acd: ATA device MacOS X: /dev/disk: win32: C:,D:,E:, ... X:,Y:,Z: OPTIONS
-l scan busses for all available CD and DVD devices -h help shows available options. -o file.iso write data to imagefile named file.iso -s # read source media with selected speed -v use verbose mode -vv use extended verbose mode INTERACTIVE MODUS
q stop reading media and exit w save sector map which is currently read and continue with the next one EXAMPLES
readdvd -d /dev/sr0 -o filename.iso -s 8 -v create an image filename.bin of inserted media in device /dev/sr0 with read speed 8 in verbose mode. please report man page improvements to T.Maguin@web.de Gennady ShultZ Kozlov 10. April, 2009 readdvd(1)
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