Web space - Chapter 4 . Learning Basic Administration 151 Here
Chapter 4 . Learning Basic Administration 151 Here is an example of the modprobe command being used to load the parport module, which provides the core functions to share parallel ports with multiple devices: # modprobe parport After parport is loaded, you can load the parport_pc module to define the PC-style ports available through the interface. The parport_pc module lets you optionally define the addresses and IRQ numbers associated with each device sharing the parallel port. For example: # modprobe parport_pc io=0×3bc irq=auto In this example, a device is identified as having an address of 0×3bc, and the IRQ for the device is autodetected. The modprobe command loads modules temporarily they disappear at the next reboot. To permanently add the module to your system, add the modprobe command line to one of the startup scripts that are run at boot time. An alternative to using modprobe is the insmod command. The advantage of using modprobe, however, is that insmod loads only the module you request, whereas modprobe tries to load other modules that the one you requested is dependent on. Removing Modules Use the rmmod command to remove a module from a running kernel. For example, to remove the module parport_pc from the current kernel, type the following: # rmmod parport_pc If it is not currently busy, the parport_pc module is removed from the running kernel. If it is busy, try killing any process that might be using the device. Then run rmmod again. Managing File Systems and Disk Space File systems in Linux are organized in a hierarchy, beginning from root (/) and continuing downward in a structure of directories and subdirectories. As an administrator of a Linux system, it s your duty to make sure that all the disk drives that represent your file system are available to the users of the computer. It is also your job to make sure there is enough disk space in the right places in the file system for users to store what they need. Note
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