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This command clone the first partition of the primary master IDE drive to the second partition
of the primary slave IDE drive (!!! back up all data before trying anything like this !!!)
Create a bunch of random files with random binary content. Basically dd dumps randomly from your hard disk to files random-file*.
This will create a 10 MB file named testfile.txt. Change the count parameter to change the size of the file.
As one commenter pointed out, yes /dev/random can be used, but the content doesn't matter if you just need a file of a specific size for testing purposes, which is why I used /dev/zero. The file size is what matters, not the content. It's 10 MB either way. "Random" just referred to "any file - content not specific"
If you don't want your computer to try to boot form a USB stick that used to be used as a boot device (maybe for a live linux distro), you will have to remove the boot loader from your stick other wise the boot will fail each time the device is attached to your PC.
Create a temporary file that acts as swap space. In this example it's a 1GB file at the root of the file system. This additional capacity is added to the existing swap space.
Replace (as opposed to insert) hex opcodes, data, breakpoints, etc. without opening a hex editor.
HEXBYTES contains the hex you want to inject in ascii form (e.g. 31c0)
OFFSET is the hex offset (e.g. 49cf) into the binary FILE
if you need see progress of long dd command, enter subj on other console
This will create an exact duplicate image of your hard drive that you can then restore by simply reversing the "if" & "of" locations.
sudo dd if=/media/disk/backup/sda.backup of=/dev/sda
Alternatively, you can use an SSH connection to do your backups:
dd if=/dev/sda | ssh firstname.lastname@example.org dd of=~/backup/sda.backup