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A shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. A shell usually interprets a single line of input, but we can also create a file containing a number of lines of commands to be interpreted. This file is a program known as a shell script. The program can also contain control structures (if-then, loops). Shell scripts allow a sequence of commands to be executed automatically . UNIX Operating System (OS) Tutorial for Beginners - Learn fundamentals of UNIX in simple and easy steps starting from basic to advanced concepts with examples including of Getting Started, Unix Korn and Bourne Shell and Programming, File Permission / Access Modes, Environment, Utilities, Pipes and Filters, Network Communication Utilities, File System, Directories, Memory Management, Special Variables, vi editor, What is Shell?, Using Shell Variables, Arrays, Basic Ope