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addressed by addressing a file. Before discussing how this works, take a look at this short and incomplete list of some important device files that can be used: /dev/null: The null device is a special software routine that helps with testing. It throws away all data written to it (while reporting success) and immediately returns EOF when read from. Use this device to redirect to nowhere. /dev/ttyS0: The first serial port. /dev/lp0: The first legacy LPT printer port. /dev/hda: The master IDE device on IDE interface 0 (typically your hard drive). /dev/hdb: The slave IDE device on IDE interface 0 (not always in use). /dev/hdc: The master device on IDE interface 1 (typically your optical drive). /dev/sda: The first SCSI or serial ATA device in your computer. /dev/sdb: The second SCSI or serial ATA device in your computer. /dev/sda1: The first partition on the first SCSI or serial ATA device in your computer. /dev/tty1: The name of the first text-based console that is active on your computer (from tty1 up to tty12). /dev/fd0: The diskette drive in your PC. One way of using redirection together with a device name is by redirecting error output of a given command to the null device. You would use a command like grep root * 2> /dev/null to do this. Of course, there s always the risk that your command is not working properly because it s been prevented and for a good reason. In this case, use (for example) the command grep root * 2> /dev/tty12, which would log all error output to tty12. This can also be activated with the key sequence Alt+F12 (use Ctrl+Alt+F12 if you are working from a graphical environment). Another cool feature you can use with redirection is sending the output from one device to another device. To understand how this works, let s first look at what happens when you are using cat on a device, as in cat /dev/sda. This command would display the complete content of the sda device on the standard output. The interesting thing when displaying the contents of a storage device like this is that you can redirect it. Imagine a situation in which you have a /dev/sdb as well, and this sdb device is at least as large as /dev/sda and is empty at the moment. You can clone the disk just by using cat /dev/sda > /dev/sdb! However, this redirecting to devices can be very dangerous. Imagine what would happen if you were foolish enough to issue the command cat /etc/passwd > /dev/sda; it would just dump the content of the passwd file to the beginning of the /dev/sda device. And, because you re working on the raw device here, no file system information is used, and this command would overwrite all important administrative information that is stored at the beginning of the device that is mentioned. And you would never be able to boot the device again! In 4, you will learn about the dd command, which can be used to copy data from one device to another device in a way that is much more secure.
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Another useful task you should be able to perform on your server is finding files, and find is the most powerful command to use for that. The find command helps you find files based upon any property a file can have. For starters, you can find files by their names; the access, creation, or modification date; the user who created them; or the permissions set on the file. If you want to find all files whose name begins with hosts, use find / -name "hosts*". I recommend always putting the string that refers to the file you are looking for between quotes because doing so ensures that find knows where the argument starts and where it stops.
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