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UNIX is an operating system that support multi-user and multi-tasking in a time sharing environment. Unix OS is used for both server and workstation.
Kernel is the name of Operating System in UNIX. It is the kernel Job to keep each process and user separate and to regulate to access the system hardware
User programs interact with kernel through set of standard system calls. These system calls provide requested service by kernel. Services like open, close, read, write or execute file and changing accessibilityof file and enable access of hardware devices.
UNIX was developed by a group of AT&T employee at Bell Labs, including Ken Thompson, Dennis Ritchie, Douglas Macllroy, Rudd Canaday and Tom Blakeley in 1969.
An inode is special file designed to be read by kernel to learn the information about each file. It specifies the permissions on file, ownership, date of creation and of last access, and change and the physical location of data block on the disk containing the file.
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