History of Unix operating system.
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This system is considered one of the oldest operating systems in the computer and appeared in 1969 among universities and research centers and BELL laboratories they make the first version of UNIX operating system and the UNIX can be move between different computer and it provides hundreds of programs that makes the the system easy to use
Unix system considered from the powerful operation systems because it depends on various concepts:
_Multitasking: means that UNIX can make more than one task in the same time
_Multi user: means that UNIX allow more than one user to sign in to the system
_Distributed: means that UNIX allow the users to use the system resources through the network
Stable: means that the system has no freeze problems
Security: means that there is no viruses in the system
Types of application software: like realplayer drawer office
The ability to connect to devices that uses Windows system
The UNIX system contains an instant chatting programs like (icq,aol)
We would talk about the important advantgae of this system that is this system has a graphical interface.
The main disadvantage of this operating system that it doesn’t setup in any computer it needs a special computers like (IBM and COMPAQ)
File system is a system defined by the kernel of the system tells us how to store the files and the main built of system files created from symbols and files
The types the symbols in the system:
_main symbols and it has another name (root)
1_(/):means that this the base of the system
2_(USR/):folder composes from files and evidences
3_(bin/):this folder contain the operation files for the system
4_(home/):this folder include the virtual evidences
5_(dev/):folder includes all files of the connected devices in the system