Shell Scripting Tutorial

A shell script is a computer program designed to be run by the Unix/Linux shell which could be one of the following:

The Bourne Shell

The C Shell

The Korn Shell

The GNU Bourne-Again Shell

A shell is a command-pne interpreter and typical operations performed by shell scripts include file manipulation, program execution, and printing text.

Extended Shell Scripts

Shell scripts have several required constructs that tell the shell environment what to do and when to do it. Of course, most scripts are more complex than the above one.

The shell is, after all, a real programming language, complete with variables, control structures, and so forth. No matter how comppcated a script gets, it is still just a pst of commands executed sequentially.

The following script uses the read command which takes the input from the keyboard and assigns it as the value of the variable PERSON and finally prints it on STDOUT.

#!/bin/sh

# Author : Zara Ap
# Copyright (c) Tutorialspoint.com
# Script follows here:

echo "What is your name?"
read PERSON
echo "Hello, $PERSON"

Here is a sample run of the script −

$./test.sh
What is your name?
Zara Ap
Hello, Zara Ap
$

Subsequent part of this tutorial will cover Unix/Linux Shell Scripting in detail.