Special Variables in SHELL/BASH Scripting | Linux Hacking Tutorial | Linux | Bash/shell Scripting

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Shell scripting is a way to automate tasks in a Unix-based operating system, such as Linux or macOS. A shell script is a text file that contains a series of shell commands, and is executed by the shell interpreter. Shell scripts are commonly used to automate tasks that are frequently executed or to create simple programs.

To create a shell script, you can use a text editor to write the commands that you want to execute. The first line of the script should specify the shell interpreter that you want to use to run the script, such as bash or sh. For example:

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#!/bin/bash
Then, you can add the commands that you want to execute, one per line. For example:

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#!/bin/bash

echo "Hello, world!"
To make the script executable, you need to set the correct permissions using the chmod command. For example:

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chmod +x myscript
You can then run the script by typing its name at the command prompt:

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./myscript
Shell scripts can include a wide variety of commands, such as cd to change the current directory, echo to print messages to the screen, and mkdir to create directories. You can also use variables and control structures, such as if statements and for loops, to create more complex scripts.
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