Unix is a multi tasking, multiuser computer operating systems that derive from the original AT&T Unix, developed in the 1970s. It is a layer between the hardware and the applications that run on the computer.
Different types of Unix operating systems are Sun solaris, GNU/Linux, and MacOS x.
Unix Operating System
The unix operating system made up of three Parts
1.The kernel
2.The shell
3.Programs
Kernal
The kernel is the heart of a UNIX system and manages the hardware, executing processes etc. When the computer is booted, kernel is loaded into the computer's main memory and it remains there until the computer is shut down. The kernel performs many low-level and system-level functions.
Shell
The instructions to the kernel are complex and highly technical. To protect the kernel from the short comings of user, a shell is built around the kernel. The Shell acts like a mediator between the user and the kernel. Whenever a user run a command, the shell interprets the command and passes the command to the kernel.
Three types of shell are standard in Unix
Bourne shell: Most widely used shell and is a program name with sh. It prompts with $ symbol.
Korn shell: Called by the name ksh.
C shell: It is called by csh.
Different types of Unix operating systems are Sun solaris, GNU/Linux, and MacOS x.
Unix Operating System
The unix operating system made up of three Parts
1.The kernel
2.The shell
3.Programs
Kernal
The kernel is the heart of a UNIX system and manages the hardware, executing processes etc. When the computer is booted, kernel is loaded into the computer's main memory and it remains there until the computer is shut down. The kernel performs many low-level and system-level functions.
Shell
The instructions to the kernel are complex and highly technical. To protect the kernel from the short comings of user, a shell is built around the kernel. The Shell acts like a mediator between the user and the kernel. Whenever a user run a command, the shell interprets the command and passes the command to the kernel.
Three types of shell are standard in Unix
Bourne shell: Most widely used shell and is a program name with sh. It prompts with $ symbol.
Korn shell: Called by the name ksh.
C shell: It is called by csh.
