About Linux Operating System:
Linux
is open source, many individuals and groups in the larger community have
created their own versions of the OS
Linux
OS secure compare to windows.
Linux
is one of popular version of UNIX operating System.
Linux
no hardware specific.
Linux
source code will be user accessible.
Source
code anyone can (Edit, View, Write) the Linux source code.
Linux
– Open source, Free, Highly secure, easy to maintenance, all hardware support.
Its
open source so everyone provide security level update.
License
Models:
GPL,
creative commons, MIT, Apache, BsD.
Linux
distributions operating systems:
Here are some popular Linux distributions:
Android - for smart phones
CentOS - for enterprise deployment
OpenSUSE for enterprise deployment
Scientific Linux for specially optimized for
scientific and advanced mathematical applications
Kali Linux for network security testing and management
Ubuntu - Ubuntu Linux as an operating system for daily
use. We use it for many purposes, for example, supporting, developing,
configuring, and scripting.
Linux
Distribution Families
Debian
Ubuntu,
Mint, and Kali Linux
Red
Hat Enterprise Linux
CentOS
and Fedora
SUSE
OpenSUSE
Linux
System Architecture:
Linux System architecture consists of the following layers
Hardware
Layer:
Hardware consists of all peripheral devices (RAM/ HDD/ CPU etc).
Kernel:
Heart of the OS, Major activity kernel only takes, kernel will
communicate with hardware, set of module is called kernel.
It is the core component of Operating System, interacts directly
with hardware, and provides low level services to upper layer components.
Shell:
Interface between user or application and kernel an interface to
kernel, hiding complexity of kernel's functions from users. The shell takes
commands from the user and executes kernel's functions.
Note: shell take user input to pass kernel.
Utilities:
Utility programs that provide the user most of the functionalities
of an operating systems.
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