Part III Using the Command Line in SUSE Linux in .NET

Implement Code 128B in .NET Part III Using the Command Line in SUSE Linux
Part III Using the Command Line in SUSE Linux
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Working with Disk Images
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It is very useful to be able to take a floppy disk or CD and create an image file from it on your hard disk from which you can create new copies of the disk, possibly after modifying them first. You can even create a disk image of a hard disk partition or an entire hard disk if you have sufficient disk space. Linux makes it easy to work with disk images because copying a disk (a floppy disk or a CD or a hard disk partition) to a file is a simple matter.
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user@bible:~> dd if=/dev/fd0 of=floppy.img
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The dd command reads the raw data from the device /dev/fd0 (the floppy disk) and writes it to the image file floppy.img. You can now mount this image (you may need to become root):
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root@bible : ~ # mount floppy.img /mnt o loop
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If you look in /mnt you see exactly the same files that you would have seen if you had mounted the floppy disk. You need the option -o loop to the mount command to mount a filesystem from a file rather than a disk device. (The -o loop option is discussed in more detail later in the chapter.) If you want to write the image back to another floppy, use the following:
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user@bible:~> dd if=floppy.img of=/dev/fd0
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This is exactly the same process in reverse: Now the input to the dd command is the image file, and you are writing to the floppy disk.
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Caution Be very careful with the dd command. If you mix up the if= with the of= you could end up doing very serious damage, particularly if one of them is a hard disk partition.
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You can do exactly the same thing with disk partitions:
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root@bible : ~ # dd if=/dev/hda1 of=imagefile
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In this case it is certainly best if /dev/hda1 is not mounted at the time. This is something you might find yourself doing in the rescue system. For example, it s possible to imagine circumstances in which you might run the rescue system, get on to the network, mount an NFS share from somewhere on the network, and then copy the disk partitions across to that share to back them up before doing something drastic to the system. When you have copied the partition to a file, again you can simply mount the file (with the
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-o loop option): root@bible : ~ # mount imagefile /mnt o loop
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14 Working with the System
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A CD image (ISO image) will work in exactly the same way; to copy a CD to an ISO image, do the following:
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user@bible:~> dd if=/dev/cdrom of=cdimage.iso
Again, you can mount it:
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root@bible : ~ # mount cdimage.iso /mnt o loop
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Creating ISO images
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Data CDs almost always use the ISO 9660 filesystem (so called after the international standard that defines it). CD images are therefore usually referred to as ISO images. In fact, you can, if you wish, create CD images and CDs using standard Linux filesystems (ext2, for example), but these will not be useful for exchanging data with users of other operating systems. A quick way to save or back up a moderate amount of data is to create an ISO image containing that data and burn it to a CD. The tool for creating ISO images is mkisofs. The man page for mkisofs is fairly bewildering to say the least because there is a very large number of options. But for most purposes, the recipe we discuss will probably do exactly what you want. Suppose you have a directory work under your home directory. You want to create a CD containing this directory s contents, and you know that the total amount of data is not too big to fit on a CD.
user@bible:~> mkisofs -J -r -o work.iso work/
This makes a filesystem of type iso9660 and copies the contents of the directory work into it. The options -J and -r here indicate that the ISO will have Joliet and Rock Ridge extensions (this should mean that the resulting CD works fine on Windows, Mac OS, and Linux systems). The -o indicates the name of the output file. You should now be able to mount work.iso and check that it has been correctly created: