Describe the purpose of shell scripts. Provide one example to reflect the use of variables, constructs, or functions.

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Explanation:

Shell scripts are used for writing codes which may involve writing together a complete set of task in a single script. These set if codes or instructions could be run at once without having to run this program one after the other on a command line. This way it avoid having to repeat a particular task each time such task is required. As it already combines a sequence of command which would or should have been typed one after the other into a compiled single script which could be run at once.

A shell script could be written for a control flow construct :

if [expression]

then (command 1)

else (command 2)

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