Shell is a piece of software that provides an interface for users. Typically, the term refers to an operating system shell which provides access to the services of a kernel.
A shell is a piece of software that provides an interface for users. Typically, the term refers to an operating system shell which provides access to the services of a kernel. However, the term is also applied very loosely to applications and may include any software that is "built around" a particular component, such as web browsers and email clients that are "shells" for HTML rendering engines. The name 'shell' originates from shells being an outer layer of interface between the user and the innards of the operating system (the kernel). Operating system shells generally fall into one of two categories: command line and graphical. Command line shells provide a command line interface (CLI) to the operating system, while graphical shells provide a graphical user interface (GUI).
Shell programming is noting but a sequence of instructions which includes some of the shell commands. It provide the way to achieve complex task which can not be achieved by command line. Shell scripts are mostly used to for file manipulation.
As similar to unix commands a sequence of unix/linux commands can be placed in to a file for achieving a complex task. This is known as shell script
