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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 5: The Linux Operating System
      9  Command Line Functions And Administrative Utilities

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du - Estimate File Space Usage
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Overview of Processes, Sessions and Daemons
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Process Management

Managing a Linux system requires a system administrator to not only monitor users, and the file system, but also the various processes that are running. Various aspects of a process will be discussed then several command line tools that can be used to control and manage the processes the system is running.

What’s in a Name?

Remember one of the basics tenets of Linux: it treats all of its resources like a file and assigns all devices a file name.


Device resources can be found in the /dev directory. For example, the name for CD-ROM might be /dev/cdrom (actually, this is probably a link or pointer to the actual device within the same directory). This device is actually indirect address, since its file system mounted in the root file system, typically at /mnt/cdrom. Other devices such as a printer might be accessed by writing directly to its device name, /dev/lp0, for the first parallel port printer. A console that is directly connected to the computer would probably be /dev/tty0. For most commands, this might be the standard input and standard output device..

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du - Estimate File Space Usage
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Overview of Processes, Sessions and Daemons
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