Shell on Unix operating system
UNIX is a powerful operating system first developed by Ken Thompson and Dennis Ritchie at AT&T Bell Labs in 1970. Unix operating system is popular in scientific, engineering and educational institutions due to its highly commendable features such as multitasking, flexibility, etc. In UNIX, the file system is a hierarchical structure of files and directories that users can use to store and retrieve files and information. Unix operating system features In this section, a complete review of the features of the Unix operating system is discussed. picture (1) Multitasking : Unix operating system is a multitasking operating system that allows you to run multiple tasks through a terminal, so that one task is done in the foreground and other tasks are done in the background.In the UNIX operating system, it is possible to support multiple users to access Uruguay Phone Number List computer resources such as main memory, hard disk, tape drive (a data storage device that performs the process of reading and writing on a magnetic tape) and so on. .. There is. Users can log into the system from different terminals and perform different tasks. In this case, the resources of a system or server are shared. The UNIX operating system works on the principle of time-sharing. For this purpose, a scheduler is created and divides the processor time (CPU) into several small parts, which are called time slices, and according to the program, each part is assigned to a user.
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This time slice is very short and when it ends, control is passed to the next user in the system. Each user executes commands during his time slot. Portability : This feature makes UNIX work on a variety of machines and platforms and adapts to them by easily transferring the code to any computer system. Portability comes from the fact that a significant portion of the Unix operating system is written in C and only a small portion is coded in assembly language for specific hardware. File security and protection : As a multi-user system, UNIX places special importance on file and system security. In Unix, there are different levels of security, including assigning a username and password to each user to perform the authentication process.
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