A). Multiuser: A multi-user Operating system allows more than one user to share the same computer system at the same time.
B). Multi Tasking: More than one program can be run at a time. The main concept of multitasking is maximum utilizing CPU resources
C). Open System: The UNIX is open source code i.e Any user can modified Unix open source code according there ideas and requirements
- Using UNIX open source codeSun Micro Systems+ Adding additional features =Sun SalariesIBM+Adding additional feature = IBM-AIXHP+Adding additional feature= HP=UXSunta Curuz + Adding additional feature= SCO-UnixSilicon Graphics +Adding additional feature= IRIXMicro Soft+Adding additional feature = xenix
- Any operating system developed based on UNIX open source code known as flavors of UNIX
- The Linux was given to GPL (General Public License) Organized by GNU.
- Linux Torvalds, who was then a student at the university of Helsinki in fin land, developed Linux in 1991. Linux is also open system
Distributors of Linux
- Red Hat
- Suse
- Ubuntu
- Puppy
- Slakware
- Centos
- OEL
- Fedora
- White box
- Mandrake
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D). Security: One of the most valued advantages of linux over the other plat forms lies with the high security levels it ensures. Every linux user is happy to work in a virus-Free environment and use the regular virus – prevention time needed when working with other operating systems for other more important task.
--> UNIX/LINUX has given two levels of securities.
- System level Security: Its controlled by system Administrator.
- File level Security: Its controlled by owner of the file.
E). Portability: Portability means Independent of hardware & processors
F). Communication: The main concept of communication facility Exchanging of information or files form one user account to other user account.
G). Programming Facility: UNIX o/s provides shell. Shell works like a programming language. It provides commands and keywords.
| Script Language | Programming Language |
| It is an interpreter based language. | Compiler based language |
| Interpreter Converts high level | The whole program in a single short into machine language. |
| Doesn’t create .exe files | Create .exe files |
| No need to compile the program. | Need to compile the program |
| It takes less lines of code | Takes numerous lines of code. |
| Reduces cost of maintenance | Increases cost of maintenance. |
H). Help facility : It is the beautiful feature of UNIX/ LINUX Operating systems. Don’t know the information about given command just go through the help line.
Example:
#Man <command name>
(or)
#info <Command name>
(or)
#<command name> --help
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