> For the complete documentation index, see [llms.txt](https://predator-os.gitbook.io/predator-os-beginner-guide-book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://predator-os.gitbook.io/predator-os-beginner-guide-book/chapter-7.md).

# Chapter 7

KDE Plasma Desktop, also referred to simply as Plasma, is a graphical user interface (GUI) environment designed primarily for Linux systems \[Wikipedia KDE Plasma 5]. It's known for being customizable and user-friendly.

See the first item in menu that is for introducing of Predator**-**OS**.**

Most filesystem implementations define seven types of files**.** Even when developers add something new and wonderful to the file tree **(**such as the process information under **/proc),** it must still be made to look like one of these seven types**:**

**Pathname Contents**

**/bin**

Core operating system commands

**/boot**

Boot loader**,** kernel**,** and files needed by the kernel

**/compat**

On FreeBSD**,** files and libraries for Linux binary compatibility

**/dev**

Device entries for disks**,** printers**,** pseudo**-**terminals**,** etc**.**

**/etc**

Critical startup and configuration files

**/home**

Default home directories for users

**/lib**

Libraries**,** shared libraries**,** and commands used by **/**bin and **/**sbin

**/media**

Mount points for filesystems on removable media

**/mnt**

Temporary mount points**,** mounts for removable media

**/opt**

Optional software packages **(**rarely used**,** for compatibility**)**

**/proc**

Information about all running processes

**/root**

Home directory of the superuser **(**sometimes just **/)**

**/run**

Rendezvous points for running programs **(**PIDs**,** sockets**,** etc**.)**

**/sbin**

Core operating system commands a

**/srv**

Files held for distribution through web or other servers

**/sys**

A plethora of different kernel interfaces **(**Linux**)**

**/tmp**

Temporary files that may disappear between reboots

**/usr**

Hierarchy of secondary files and commands

**/usr/bin**

Most commands and executable files

**/usr/include**

Header files for compiling C programs

**/usr/lib**

Libraries**;** also**,** support files for standard programs

**/usr/local**

Local software or configuration data**;** mirrors **/**usr

**/usr/sbin**

Less essential commands for administration and repair

**/usr/share**

Items that might be common to multiple systems

**usr/share/man**

On**-**line manual pages

**/usr/src**

Source code for nonlocal software **(**not widely used**)**

**/usr/tmp**

More temporary space **(**preserved between reboots**)**

**/var**

System**-**specific data and a few configuration files

**/var/adm**

Varies**:** logs**,** setup records**,** strange administrative bits

**/var/log**

System log files

**/var/run**

Same function as **/**run**;** now often a symlink

**/var/spool**

Spooling **(**that is**,** storage**)** directories for printers**,** mail**,** etc**.**

**/var/tmp**

More temporary space **(**preserved between reboots**)**